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To systematically review evidence assessing the evolution of cannabis consumption before and after the implementation of non-medical cannabis legislation.MEDLINE, PubMED, PsycINFO, Scopus, and Web of Science were systematically searched for studies that examined change in cannabis consumption before and after nonmedical cannabis legislation. Data were tabulated by study design, levels of consumption, and individual subgroups. Data were analyzed using a narrative synthesis approach, considering study quality.32 studies were included (11 higher quality and 21 lower quality). 40% of higher quality evidence supported an increase in postlegalization consumption (55% did not report a change and 5% reported a decrease). The increase was most evident for young adults (42% of higher quality evidence) and in the consumption in the past month (37% of higher quality evidence). There was limited supporting evidence for new users having grown in response to legalization. Based on subgroup analysis, the increase in postlegalization consumption was higher among women and those who engage in binge-drinking.Higher quality evidence suggests an increase in adolescent past-month consumption of cannabis following legalization in several geographical jurisdictions. Consumption evolution prelegalization and postlegalization differed by age group and for young women and for binge drinkers. Consumption evolution differences suggest a variety of strategies might be required in efforts to lower public health impacts of cannabis consumption following legalization.

Objectives Distress and associated health problems reported by Nunavik Inuit emanate from heterogeneous roots, including adverse childhood experiences. This study aims to (1) identify distinct childhood adversity profiles and (2) examine associations between these profiles and sex, socioeconomic characteristics, social support, and community involvement among Nunavimmiut. Methods In a sample of 1109 adult Nunavimmiut, sex, socioeconomic characteristics, support, community involvement, residential school attendance, and 10 forms of adverse childhood experiences (ACEs) were documented using questionnaires. Latent class analyses and weighted comparisons were performed for three subgroups: 18–49 years; 50 years and above with experience of residential school; and 50 years and above without experience of residential school. The analysis design, the manuscript drafts, and the key findings were discussed and co-interpreted with the collaboration of community representatives, taking into consideration Inuit culture and needs. Results A total of 77.6% of Nunavimmiut reported having experienced at least one form of childhood adversity. Three ACE profiles were identified among the 18–49-year-olds: low ACEs (43.0%), household stressors (30.7%), and multiple ACEs (26.3%). Two profiles characterized ACEs experienced among the 50-year-olds and over with and without history of residential schooling: low ACEs (80.1% and 77.2%, respectively) and multiple ACEs (19.9% and 22.8%, respectively). Among the group of 18–49-year-olds, as compared to the low ACE profile, the profile with household stressors included proportionally more women (odds ratio [OR] = 1.5) and was associated with lower involvement in volunteering and community activities (mean score reduced by 0.29 standard deviation [SD]) and lower family cohesion (SD = − 0.11), while the multiple ACE profile was related to a lower rate of employment (OR = 0.62), lower family cohesion (SD = − 0.28), and lower satisfaction with ability to practice traditional activities (SD = − 0.26). Conclusion Childhood adversities among Nunavimmiut do not occur in isolation and experiencing multiple forms of childhood adversities predicts lower socioeconomic status, support, and community involvement in adulthood. Implications for the planning of health and community services in Nunavik are discussed.

Background Adolescents are increasingly aware of the treats of climate change and encouraged to take part in environmental actions. However, the current understanding climate anxiety adolescents is sparse. This study establishes the characteristics of adolescents who experience functional impairments induced by climate anxiety and who adopt pro-environment behaviours. It also characterizes the association between climate anxiety, feelings of self-efficacy and environmental actions. Methods 2 379) from 113 schools in Quebec answered questions about climate anxiety, self-efficacy, behavioural engagement and several indicators of wellbeing. Data were analysed using poisson regressions adjusted for potential confounders (age, gender, school type, material deprivation, etc). Results More than one in ten adolescents (11%) reported that thinking about climate change makes it difficult to sleep or interferes with their ability to get work or assignments done. Only 35% of adolescents believed that they can do something to address the problem and 44% tried to reduce their behaviors that contribute to climate change. Adolescents who are boys and who are less anxious were less preoccupied and involved in the fight against climate change. Teenagers from less affluent families were more concerned, but not more engaged. Those with a good relationship with their family and strong school connectedness were both less concerned and more involved in the fight against climate change. Adolescents who felt they can do something about climate change were more likely to try to reduce behaviors that contribute to climate change. Conclusion The findings are useful to identify and support vulnerable groups that are more likely to experience functional impairments due to climate anxiety. The feeling of climate self-efficacy was not well developed among some groups of adolescents. Improving the youth’s beliefs in their capacity to help address the climate change may be a key strategy to promote pro-environmental actions. As the threat of climate change increases, it will be important to follow the evolution of climate anxiety and engagement amongst adolescents.

Medical cannabis (MC) may offer therapeutic benefits for children with complex neurological conditions and chronic diseases. In Canada, parents, and caregivers frequently report encountering barriers when accessing MC for their children. These include negative preconceived notions about risks and benefits, challenges connecting with a knowledgeable healthcare provider (HCP), the high cost of MC products, and navigating MC product shortages. In this manuscript, we explore several of these barriers and provide recommendations to decision-makers to enable a family-centered and evidence-based approach to MC medicine and research for children.

Background Adolescence is a critical period for vaping onset. The purpose of this article was to examine the effect of the early stages of the COVID-19 pandemic period on youth vaping. Methods We used 3-year linked data from the COMPASS study, including 7585 Canadian (Quebec, Ontario) adolescents from which 1949 completed all three survey waves (pre-COVID-19 [2018, 2019] and online [2020] during the early pandemic period [May–July 2020]) and provided vaping data. Structural equation modeling (SEM) and difference-in-difference (DD) models were used to estimate pre-COVID-19 to initial COVID-19 pandemic period change (2019–2020) in vaping (monthly, weekly, daily) compared with 2018–2019 change to adjust for age-related effects. Models were adjusted for age of entry into the cohort and sociodemographic characteristics. Results In the SEM and DD models, the proportion of youth who were monthly and weekly vaping increased from 2018 to 2019 but decreased from 2019 to 2020; daily vaping increased across all waves. However, for all vaping outcomes modeled, the expected increases from the pre-COVID-19 wave (2019) to the initial COVID-19 period wave (2020) were lesser relative to the changes seen across the 2018 to 2019 waves. Conclusion The early stages of the COVID-19 pandemic period appear to be associated with a reduction in the proportion of youth who were monthly and weekly vapers in our adjusted longitudinal models. While daily vaping increased over this same period of time, the magnitude of the increase in our adjusted longitudinal models appears attenuated by the early stages of the pandemic. Implications This large prospective study of youth that included pre-pandemic data is unique in that we were able to identify that the early stages of the COVID-19 pandemic period was associated with a reduction in the proportion of youth who were monthly and weekly vapers in our adjusted longitudinal models. Conversely, the proportion of youth who were daily vaping increased over this same period of time, but the magnitude of the increase appears smaller than expected during the early stages of the pandemic in our adjusted longitudinal models. This study provides novel robust evidence that the patterns of vaping most aligned with onset and progression (i.e., monthly and weekly use) appear attenuated during the initial pandemic period.

Understanding risky sexual behaviors among adolescents is key in efforts devoted to reducing the health burden related to sexually transmitted infections and unintended or unplanned pregnancies. The aims of this study were to understand the association between number of lifetime sexual partners and time since sexual debut (TSSD) among adolescents and to determine whether sex modified this association. Data were drawn from the 2018-2019 COMPASS-Quebec study, a cohort study conducted in secondary schools in the province of Quebec, Canada. Of 18,467 respondents aged 14 years and older, 6991 (37.9%; mean age 15.3) reported consensual sexual intercourse and answered questions on their age at sexual initiation and number of lifetime sexual partners. Multilevel Poisson regressions with robust standard errors were estimated to adjust for covariates and produce adjusted group mean differences. The adjusted mean number of lifetime sexual partners ranged from 1.5 for those who had recently begun sexual activity ( 12 months) to 4.0 for those who had been active for 35 months, an average rise of about 0.6 per year. Females-to-males adjusted mean differences showed that males reported more sexual partners than females at all time points, but the differences were only significant at the shorter ( 12 months) and longer ( 35 months) time spans. This study highlights the importance of taking into account TSSD when using and interpreting the number of lifetime sexual partners as risky sexual behavior among adolescents. Sex did not have a significant modifying effect on the relationship between number of lifetime sexual partners and TSSD.

Objective Stemming from historical traumas and changes in the Inuit way of life, substance use and its intertwined problems are a major cause of concern for Nunavimmiut. This study’s objective is to investigate sociocultural determinants of substance use and misuse to inform culturally appropriate public health programs. Methods The 2017 Qanuilirpitaa? survey was conducted among a sample intended to be representative of Nunavimmiut aged 16 and over (total n = 1326). Sociocultural factors included cultural identity, land-based activities, involvement in community activities, social support, and family and community cohesion. The frequency of binge drinking (5 or more drinks on one occasion), cannabis use, and problematic substance use (CAGE and DAST-10) were documented. Data were analyzed using weighted multivariate logistic regressions. Inuit partners were involved from the planning of analyses to the co-interpretation of results. Results Nearly a third of Nunavimmiut aged 16 and over reported binge drinking at least once a week (29.3%), and 68.6% of drinkers were at risk of potential drinking problems. Forty-five percent (45%) reported using cannabis at least once a week, and 30% of drug users were at risk of potential drug abuse problems. Volunteering and participation in community activities were associated with lower odds of cannabis use, as was frequently going on the land with weekly binge drinking, potential drinking problems, and weekly cannabis use. Social support and community cohesion were associated with higher odds of weekly binge drinking, as was cultural identity (centrality scale) with potential drinking problems. Conclusion Key determinants of substance use relevant to Inuit culture were identified. Results are in line with our Inuit partners’ experience in their communities and are coherent with current land-based interventions implemented in Nunavik. A thorough understanding of substance use contexts and related stressors should guide the content and implementation of substance use programs in Nunavik.

Introduction La présente étude avait pour objectifs d’explorer dans quelle mesure les adolescents ont adopté des mesures préventives contre la COVID-19 au cours des premiers mois de la pandémie et de comprendre leur adoption par l’examen de facteurs indépendants liés à l’adoption et par la détermination de la puissance de ces facteurs, en particulier parmi les sous-groupes qui ne sont pas censés être les premiers à adopter de telles mesures. Méthodes Les analyses portent sur des données recueillies au printemps 2020 auprès de 29 écoles secondaires de l’est du Québec qui ont participé à l’étude COMPASS. Les participants (n = 6 052) ont déclaré eux-mêmes leurs connaissances, leur perception du risque et les pratiques de prévention à adopter dans le contexte de la pandémie de COVID-19. Les données ont été analysées à l’aide de modèles d’équation structurelle fondés sur le sexe et le niveau d’anxiété. Résultats La majorité des répondants ont déclaré avoir adopté les mesures préventives recommandées contre la COVID-19. Les résultats ont montré trois voies menant à l’adoption de ces mesures par les adolescents : les connaissances sur la pandémie, la perception du risque lié à la COVID-19 et, en particulier, les discussions avec les proches au sujet des mesures préventives et de ce qu’il faut faire en cas d’infection. Conclusion Même si la plupart des participants adolescents à cette étude ont semblé se conformer aux mesures préventives contre la COVID-19, des facteurs comme les discussions avec les proches émergent en tant qu’éléments à favoriser pour améliorer l’adoption des mesures préventives par les adolescents.

Background Chronic musculoskeletal pain (CMP) may lead to reduced physical function and is the most common cause of chronic non-cancer pain. Currently, the pharmacotherapeutic options against CMP are limited and frequently consist of pain management with non-steroidal anti-inflammatories, gabapentinoids, or opioids, which carry major adverse effects. Although the effectiveness of medical cannabis (MC) for CMP still lacks solid evidence, several patients suffering from it are exploring this therapeutic option with their physicians. Objectives Little is known about patients’ perceptions of their MC treatment for CMP. We aimed to increase this knowledge, useful for healthcare professionals and patients considering this treatment, by conducting a scoping literature review, following guidance by Arksey and O’Malley, to describe the views and perceptions of adult patients who had consumed MC to relieve chronic CMP. Methods Databases (PUBMED, EMBASE, Web of Science) and websites were searched using combinations of controlled and free vocabulary. All studies and study designs reporting on patients’ perceptions regarding MC against CMP were considered. Studies had to include adult patients reporting qualitatively or quantitatively, i.e., through questionnaires, on MC use to treat CMP or other non-cancer pain, since studies reporting exclusively on perceptions regarding CMP were very rare. Study characteristics were extracted and limitations of the study quality were assessed. The review includes patients’ demographic characteristics, patterns of MC use, perceived positive and negative effects, use of alcohol or other drugs, reported barriers to CM use, and funding sources of the studies. Results Participants of the 49 included studies reported that MC use helped them to reduce CMP and other chronic non-cancer pain, with only minor adverse effects, and some reported improved psychological well-being. In the included studies, men represent between 18 and 88% of the subjects. The mean age of participants in these studies (42/49) varied between 28.4 and 62.8 years old. The most common route of administration is inhalation. Conclusion MC users suffering from CMP or other chronic non-cancer pain perceived more benefits than harms. However, the information from these studies has several methodological limitations and results are exploratory. These user-reported experiences must thus be examined by well-designed and methodologically sound clinical or observational studies, particularly regarding CMP, where reports are very scarce.

Objectives: We examined the level of student support of mask use in public spaces and school mask requirements intended to prevent SARS-CoV-2 transmission, as well as factors associated with students’ perspectives. Methods: We used cross-sectional survey data from 42,767 adolescents attending 133 Canadian secondary schools that participated in the COMPASS study during the 2020/2021 school year. Multinomial regression models assessed support for i) wearing a mask in indoor public spaces and ii) schools requiring students to wear masks, in association with COVID-19 knowledge, concerns, and perceived risk. Results : Wearing masks in indoor public spaces was supported by 81.9% of students; 8.7% were unsupportive and 9.4% were neutral/undecided. School mask requirements were supported by 67.8%, with 23.1% neutral and 9.1% unsupportive. More females supported mask wearing in public spaces (83.9% vs. 79.1%) and school mask requirements (70.8% vs. 63.5%) than males. Students had increased odds of supporting mask use in public spaces and school mask requirements if they reported concerns about their own or their family’s health, had discussions regarding ways to prevent infection, perceived COVID-19 to be a risk to young people, and knew that signs are not always present in COVID-19 cases and that masks prevent SARS-CoV-2 transmission if someone coughs. Conclusions : During the year following the beginning of the pandemic, most students supported wearing masks in indoor public spaces and the required use of masks in schools. Improving knowledge around the effectiveness of masks appears likely to have the largest impact on mask support among adolescent populations.

We developed and validated an 8-item prognostic tool to identify youth at risk of initiating frequent (i.e., at least weekly) cannabis use in the next year. The tool, which aims to identify youth who would benefit most from clinician intervention, can be completed by the patient or clinician using a computer or smart phone application prior to or during a clinic visit. Methodological challenges in developing the tool included selecting a parsimonious model from a set of correlated predictors with missing data. We implemented Bach’s bolasso algorithm which combines lasso with bootstrap and investigated the performance of the prognostic tool in new data collected in a different time period (temporal validation) and in another location (geographic validation). The tool showed adequate discrimination abilities, as reflected by a c-statistic above 0.8, in both validation samples. Most predictors selected into the tool pertained to substance use including use of cigarettes, e-cigarettes, alcohol and energy drinks mixed with alcohol, but not to mental or physical health.

While cannabis use among adolescents is frequent in Canada, youth do recognize the potential harms, and increasingly expect knowledgeable health care providers to discuss substance use in everyday practice. This practice point provides sound, evidence-based tools to help health professionals address nonmedical (recreational) cannabis use and its related risks. After highlighting how to make the clinical setting a safe space for youth to talk about psychoactive substances, specific strategies for approaching cannabis use in effective, developmentally appropriate ways are described. Consistent with current literature, screening questionnaires to help structure discussion and identify adolescents who may benefit from more specialized interventions are recommended. Because one in six adolescents who experiments with cannabis goes on to misuse it, appraising their willingness to change risky behaviours is a key aspect of care, along with supportive goal-setting and helping families. Recommended resources for practitioners and parents are included.

Résumé L’usage de cannabis est fréquent chez les adolescents du Canada, mais les jeunes en reconnaissent les dangers potentiels et s’attendent de plus en plus à ce que des dispensateurs de soins bien informés leur parlent d’usage de substances psychoactives dans leur pratique quotidienne. Le présent point de pratique propose de solides outils fondés sur des données probantes pour aider les professionnels de la santé à parler d’usage de cannabis à des fins non médicales (récréatives) et des risques qui s’y associent. Les auteurs expliquent comment rendre le milieu clinique sécuritaire pour parler de substances psychoactives avec les jeunes et suggèrent des stratégies précises pour leur parler d’usage de cannabis de manière efficace et adaptée à leur développement. Conformément aux publications scientifiques récentes, ils recommandent des questionnaires de dépistage pour contribuer à structurer les échanges et déterminer quels adolescents pourraient profiter d’interventions plus spécialisées. Puisqu’un adolescent sur six qui expérimente le cannabis finit par en faire un usage abusif, l’évaluation de la volonté des adolescents à modifier leurs comportements à risque représente un aspect essentiel des soins, conjointement avec l’établissement d’objectifs complémentaires et l’aide aux familles. Enfin, des ressources pour les praticiens et les parents sont recommandées. Tant les parents que les adolescents se préoccupent des effets et des dommages potentiels du cannabis et des autres substances psychoactives (1,2). De nombreux adolescents considèrent les professionnels de la santé comme des sources d’information fiables sur les substances psychoactives et s’attendent à ce qu’ils abordent l’usage ou les risques qui s’y associent lors des rendez-vous de santé (3). Dans le rôle de facilitateurs et de courtiers du savoir, les dispensateurs de soins (DdS) peuvent entretenir un dialogue efficace avec les jeunes et leur famille.

Objective:The present study aims at measuring the association between household food insecurity and psychological distress in adolescents in Inuit communities, concurrently and overtime from childhood to adolescence.Design:The study used measures of internalising behaviours (anxiety, withdrawn attitude, somatic complaints and depression) as indicators of psychological distress during adolescence, a concurrent measure of household food insecurity in adolescence and an assessment of longitudinal patterns of household food insecurity from childhood to adolescence. We collected descriptive information at birth, childhood and adolescence on potential confounders.Setting:Inuit communities of Nunavik in northern Quebec, CanadaParticipants:The study consisted of 212 participants from the Nunavik Child Development Study, who have been assessed at birth, childhood (mean age = 11 years, range = 9–13 years) and adolescence (mean age = 18 years, range = 16–21 years).Results:Concurrent severe household food insecurity in adolescence was associated with higher measures of psychological distress: depression (βstd = 0·26, P < 0·01) and withdrawn attitude (βstd = 0·20, P = 0·04). Persistent household food insecurity (both at childhood and adolescence) was associated with higher levels of adolescent depression (βstd = 0·18, P = 0·02) and anxiety (βstd = 0·17, P = 0·03).Conclusions:Adolescents from Nunavik living with higher food insecurity and those having experienced food insecurity in both childhood and adolescence were more likely to report symptoms of psychological distress. Considering the high level of distress experienced by young Inuit, existing initiatives to reduce food insecurity in Nunavik communities should be targeted to include children and adolescents.

Objectives Anemia and iron deficiency (ID) are frequent among Indigenous children of Canada, but few data are available in Quebec. The present study aimed to characterize anemia and ID prevalence and associated protective and risk factors among First Nations youth in Quebec. Methods The 2015 First Nations (JES!-YEH!) pilot study was conducted among children and adolescents (3 to 19 years; n = 198) from four First Nations communities in Quebec. Blood and urine samples and anthropometric measurements were collected. Hemoglobin (Hb), serum ferritin (SF), plasma hs-CRP, and urinary cotinine levels were measured. Factors associated with anemia and ID (including traditional and market food consumption) were assessed using an interview-administered food frequency questionnaire, based on which nutritional intakes were calculated. Structural equation models were used to test associations. Results The prevalence of anemia and ID was elevated (16.8% and 20.5% respectively). Traditional meat, fruit, and fruit juice (natural and powdered)—via their positive association with vitamin C intake—were the only food variables positively associated with SF (coefficient [95% CI] 0.017 [0.000, 0.114]; 0.090 [0.027, 0.161]; and 0.237 [0.060, 0.411]). Male sex was also associated with higher SF (0.295 [0.093, 0.502]). Inflammation status (hs-CRP > 5 mg/L) was inversely associated with Hb (− 0.015 [− 0.025, − 0.005]), whereas SF was positively associated with Hb (0.066 [0.040, 0.096]). Fruit and juice consumption was also positively associated with Hb, via vitamin C intake and SF (0.004 [0.001, 0.010]; 0.008 [0.003, 0.017]). Conclusions Interventions fostering healthier food environments as well as higher consumption of traditional meats and foods naturally rich in vitamin C, which is known to enhance iron absorption, and fighting inflammation could contribute to decrease the high prevalence of anemia and ID in this young Indigenous population.

This study described the distribution of unintentional injuries among Inuit youth in Nunavik, Quebec, Canada, and examined the relationship between socio-demographic factors, substance use and unintentional injuries. A cross-sectional study design was used on data collected for the Nunavik Child Development Study (2013–2015) among eligible youth aged 16 to 21 years old. Unintentional injury occurrence and causes (last 12 months) were assessed through individual interviews. A multivariate logistic regression model tested the relationship between socio-demographic, substance use variables and unintentional injury occurrence. Among the 199 youth who participated (94% response rate), thirty youth reported being unintentionally injured in the past 12 months , of which 50% were female. All-terrain vehicle collisions were the most frequent injuries reported (23%). The odds of being injured decreased by 62% for youth who were currently employed compared to those who were unemployed, adjusting for other socio-demographic variables (p-value = 0.04). Heavy alcohol drinking in the past 12 months was not significantly associated with unintentional injury. This study highlights the burden of unintentional injuries among Nunavik youth and the need for future work to explore additional and diverse variables that may prevent or contribute to injuries in order to inform culturally and developmentally-appropriate injury prevention strategies.

Objective As impacts of the COVID-19 pandemic continue to unfold, research is needed to understand how school-aged youth are coping with COVID-19-related changes and disruptions to daily life. Among a sample of Canadian youth, our objective was to examine the mental health factors associated with using substances to cope with COVID-19-related changes, taking account of expected sex differences. Methods We used online data collected from 7150 students in the COMPASS study, during the early months of the COVID-19 pandemic (May–July 2020) in British Columbia, Ontario, and Quebec, Canada. We specified a sex-stratified, generalized linear mixed model to estimate the likelihood of engagement in substance-related coping behaviours, while testing for the effects of students’ mental health, individual characteristics, and school neighborhood characteristics. Results Twelve percent of students (13.4% of females, 9.9% of males) in our sample reported using cannabis, alcohol, cigarettes, and/or vaping to help cope with COVID-19-related changes. Regardless of sex, students with greater depressive symptoms were more likely to engage in substance-related coping (aORFemale = 1.04, 95 %CI[1.01–1.07]; aORMale = 1.06, 95 %CI[1.013–1.11]). Among females, better psychosocial wellbeing was protective against engagement in substance related-coping (aOR = 0.96, 95 %CI[0.94–0.98]), controlling for current substance use. Conclusions Canadian school-aged youth with generally poor mental health may be more likely to have engaged in substance use to help cope with COVID-19-related changes during the first wave of the pandemic, and female youth may be at disproportionate risk of engaging in the behaviour. Ongoing evaluation of the impacts of COVID-19 on youth health is required.

The objectives of this study were to explore the extent to which adolescents adopted COVID-19 preventive measures in the first few months of the pandemic and to understand their adoption by looking at interconnected adoption-related factors and determining the strength of these factors, particularly among subgroups not expected to be early adopters.Analyses focus on data collected during Spring 2020 from 29 eastern Quebec secondary schools that participated in the COMPASS study. Participants (n = 6052) self-reported their knowledge, perception of risk and preventive practices to do with the COVID-19 pandemic. Data were analyzed using structural equation models based on gender and anxiety level.The majority of respondents reported adopting the recommended COVID-19 preventive measures. The results showed three paths leading to adolescents' adoption of these measures: pandemic knowledge; perception of risk related to COVID-19; and, in particular, discussions with relatives about preventive measures and what to do in case of infection.While most of the adolescent participants in this study appeared to comply with COVID-19 preventive measures, factors such as discussions with relatives emerge as elements to foster in order to improve adolescents' adoption of preventive measures.La présente étude avait pour objectifs d’explorer dans quelle mesure les adolescents ont adopté des mesures préventives contre la COVID-19 au cours des premiers mois de la pandémie et de comprendre leur adoption par l’examen de facteurs indépendants liés à l’adoption et par la détermination de la puissance de ces facteurs, en particulier parmi les sous-groupes qui ne sont pas censés être les premiers à adopter de telles mesures.Les analyses portent sur des données recueillies au printemps 2020 auprès de 29 écoles secondaires de l’est du Québec qui ont participé à l’étude COMPASS. Les participants (n = 6 052) ont déclaré eux-mêmes leurs connaissances, leur perception du risque et les pratiques de prévention à adopter dans le contexte de la pandémie de COVID-19. Les données ont été analysées à l’aide de modèles d’équation structurelle fondés sur le sexe et le niveau d’anxiété.La majorité des répondants ont déclaré avoir adopté les mesures préventives recommandées contre la COVID-19. Les résultats ont montré trois voies menant à l’adoption de ces mesures par les adolescents : les connaissances sur la pandémie, la perception du risque lié à la COVID-19 et, en particulier, les discussions avec les proches au sujet des mesures préventives et de ce qu’il faut faire en cas d’infection.Même si la plupart des participants adolescents à cette étude ont semblé se conformer aux mesures préventives contre la COVID-19, des facteurs comme les discussions avec les proches émergent en tant qu’éléments à favoriser pour améliorer l’adoption des mesures préventives par les adolescents.Adolescents’ compliance of COVID-19 preventive measures is high, even in subgroups with lower adoption rates. In addition to accurate pandemic knowledge and proper risk perception, discussions with relatives should also be considered as a means of improving adoption of COVID-19 preventive measures by adolescents.Le respect des mesures préventives contre la COVID-19 par les adolescents est élevé, même parmi les sous-groupes affichant des taux d’adoption plus faibles. Outre des connaissances précises en matière de pandémie et une bonne perception des risques, les discussions avec les proches sont un autre moyen à envisager pour améliorer l’adoption par les adolescents de mesures préventives contre la COVID 19.

Key points Children with chronic debilitating illness and pain are increasingly using cannabis for medical purposes, particularly when conventional treatment options have limited benefit or substantial adverse effects. Caregivers are becoming aware of evidence that suggests medical cannabis provides

Youth vaping presents significant risks for the health and safety of Canadian children and adolescents. This statement provides background information about vaping, vaping products, and related devices, discusses the short- and long-term harms known to be associated with their use, and offers prevention and cessation strategies for youth who vape or are at risk for starting. Youth vaping is associated with increased risk for tobacco and other substance use, mental health problems, pulmonary and cardiovascular disease, and unintentional injuries. Vaping should not be used as a smoking cessation tool for youth, due to lack of effectiveness and evidence of harm. Many preventive and treatment strategies used for tobacco cessation, including behavioural and pharmacological options, can be adapted to help youth quit vaping. Recommendations for community stakeholders and policy makers are included.

Purpose The impact of the COVID-19 pandemic on adolescent mental health is a global concern; however, most research is cross-sectional or started after the pandemic response began and thus unable to evaluate within-individual change. The purpose of this prospective study was to evaluate the effect of the initial COVID-19 response on adolescent mental health and ill-health as a natural experiment. Methods We used 3-year linked data from the COMPASS study, including 7,653 Canadian (Quebec, Ontario) adolescents from which 2,099 completed surveys in all three waves (pre-COVID-19 [2018 and 2019] and online [May–July 2020], 2–3 months into the pandemic). A structural equation modeling approach to fixed effects and a difference-in-differences design were used to estimate pre-COVID-19–to–early lockdown change in mental health (psychosocial well-being [flourishing—reverse scored]) and ill-health (depression and anxiety symptoms), compared with 2018-to-2019 change. Models were adjusted for self-selection, age of entry into the cohort, and sociodemographics. Results Depression, anxiety, and reverse-flourishing scores increased across all waves; however, the mental health changes from the pre-COVID-19 wave (2019) to 2020 were not greater relative to the changes seen across the 2018-to-2019 waves. Conclusions Our results do not support a detrimental effect of the initial stages of the COVID-19 lockdown measures on adolescent mental health. The deterioration in mental health in the early COVID-19 response was less than the decline found over a prepandemic period. Further prospective research is needed to explore the impact of the prolonged pandemic and related measures on adolescents and inequitable effects in population subgroups.

BackgroundGiven the high rates of cannabis use among Canadian youth and that adolescence is a critical period for cannabis use trajectories, the purpose of this paper was to examine the effect of the early stages of the COVID-19 pandemic period on youth cannabis use in the context of a natural experiment.We used 3-year linked data from the COMPASS study, including 7653 Canadian (Quebec, Ontario) adolescents from which 1937 completed all 3 survey waves (pre-COVID-19 [2018, 2019] and online [2020] during the early pandemic period [May–July 2020]). Structural equation modeling (SEM) and double difference (DD) models were used to estimate pre-COVID-19 to initial COVID-19 pandemic period change (2019–2020) in cannabis use (monthly, weekly, daily) compared to 2018 to 2019 change to adjust for age-related effects. Models were adjusted for age of entry into the cohort and sociodemographic characteristics.ResultsIn the SEM and DD models, monthly, weekly, and daily cannabis use increased across all waves; however, the expected increases from the pre-COVID-19 wave (2019) to the initial COVID-19 period wave (2020) were lesser relative to the changes seen across the 2018 to 2019 waves. The cross-sectional data from May to July 2020 identified that the majority of youth who use cannabis did not report increased cannabis use due to COVID-19 or using cannabis to cope with COVID-19.ConclusionDuring the early stages of the COVID-19 pandemic period, there does not appear to be a detrimental effect on youth cannabis use, when adjusted for age-related changes. Further prospective research is needed to explore the impact of the ongoing pandemic response on youth cannabis use onset and progression.

Résumé Le vapotage chez les jeunes comporte des risques importants pour la santé et la sécurité des enfants et des adolescents canadiens. Le présent document de principes fournit de l’information générale sur le vapotage et les produits et dispositifs qui y sont liés, traite des méfaits à court et à long terme associés à leur utilisation et propose des stratégies de prévention et d’abandon pour les jeunes vapoteurs ou ceux qui sont à risque de commencer à vapoter. Le vapotage chez les jeunes est associé à un risque accru d’usage de tabac et de substances psychoactives, de troubles de santé mentale, de pneumopathie, de cardiopathie et de blessures accidentelles. Le vapotage ne doit pas servir d’outil d’abandon du tabac chez les jeunes, en raison de son manque d’efficacité et des données probantes sur les méfaits qu’il occasionne. De nombreuses stratégies préventives et thérapeutiques utilisées pour l’abandon du tabac, y compris les stratégies comportementales et pharmacologiques, peuvent être adaptées pour aider les jeunes à arrêter de vapoter. Des recommandations sont formulées pour les intervenants communautaires et les décideurs.

Plants need to be protected against pests and diseases, so as to assure an adequate production, and therefore to contribute to food security. However, some of the used pesticides are harmful compounds, and thus the right balance between the need to increase food production with the need to ensure the safety of people, food and the environment must be struck. In particular, when dealing with fruit and vegetable wastes, their content in agrochemicals should be monitored, especially in peel and skins, and eventually minimized before or during further processing to separate or concentrate bioactive compounds from it. The general objective of this review is to investigate initial levels of pesticide residues and their potential reduction through further processing for some of the most contaminated fruit and vegetable wastes. Focus will be placed on extraction and drying processes being amid the main processing steps used in the recuperation of bioactive compounds from fruit and vegetable wastes.

Objective The objective of this study was to describe the outcome of healthy children presenting with newly-diagnosed neutropenia in an infectious context. Results A total of 184 episodes of neutropenia were included in children aged 3 months to 5 years. There were 118 (64%) episodes of moderate neutropenia and 66 (36%) of severe neutropenia (SN). SN episodes were more likely related to intensification of antibiotic regimen used and further investigations. The median duration of neutropenia was 8.5 days. Chronic benign neutropenia occurred in 7 (4%) patients. Conclusion SN led to intensification of antibiotic therapy, but no children encountered an unfavorable outcome and the neutropenia episodes were short-lived.

International audience; Background/aims: Given that their traditional lifestyle and diet still relies on fish and other marine species for sustenance, the Inuit are highly exposed to polychlorinated biphenyls (PCBs) and PCBs are increasingly linked to obesity. However, evidence is not consistent regarding which periods of exposure are most relevant. In this study, we examine whether in utero, childhood, and adolescent exposure to PCBs are related to physical growth at adolescence.Method: Inuit adolescents from Canada (N=212) enrolled in a prospective longitudinal cohort study since birth were assessed for height, weight, body mass index (BMI), fat mass index (FMI) and fat free mass index (FFMI) at 18 years of age. PCB 153 concentrations were quantified in blood samples obtained at birth (umbilical cord), 11, and 18 years of age. Maternal anthropometrics were measured and those for the newborns collected from medical records. Data on biological mothers and participants' sociodemographic characteristics and food security were collected using interviews. Multiple linear regression analyses were used to test associations between PCB 153 concentrations and adolescent anthropometric measures.Results: Cord PCB 153 was not related to height or FFMI at adolescence. By contrast, analyses showed that cord PCB 153 was related to higher BMI, FMI and marginally to weight in girls but not boys. Child PCB 153 was not related to height, weight or FFMI in adolescence. Child PCB 153 was related to lower BMI and FMI at adolescence in both sexes, particularly among those considered overweight or obese during childhood. Adolescent PCB 153 was not associated with any outcome.Conclusion: This study suggests that prenatal exposure to PCBs may have a long-term effect on growth in early adulthood among girls and identifies the peri-pubertal period as another window of sensitivity for the action of PCBs. Our findings also suggest that exposure to PCBs and body size be documented in multiple time periods from infancy to adulthood.

Based on the prevalence and health implications of tobacco and cannabis use, aiming to reduce their use, especially among youth, is a sound objective at both the individual and public health level. A proper understanding of the relationships between tobacco and cannabis use may help to achieve this goal.To review the relationships between tobacco and cannabis use.A selective review of the literature.We present an overview of the motivations for tobacco and cannabis use, and their perceived harmfulness. The article then reviews the gateway theory, reverse gateway theory, route of administration theory, and common liability theory. We describe the link between co-use and dependence symptoms, and the substitution phenomenon between tobacco and cannabis use. Three forms of simultaneous use-mulling, blunt smoking, and chasing-and their impacts are explained. We summarize the impact of tobacco use on cannabis (and vice versa) treatment outcomes, and, finally, review new treatments that simultaneously target tobacco and cannabis dependence. Most of the literature reviewed here relates to substance use among adolescents and young adults.The use of tobacco and cannabis-two of the most widely used substances around the world-are strongly intertwined in several respects. Both health professionals and researchers should have well-informed views on this issue to better evaluate, understand, inform, and provide care to their patients.

Background Boys use cannabis at a younger age and more frequently than girls. It has been suggested these sex differences might vary according to students' relationship to school. We explored whether the association between sex and adolescents' cannabis use varies among schools and according to students' school connectedness. Methods The study population consisted of all students from 11 secondary schools in the greater Quebec City area. The sample included 6185 respondents in years 1 to 5 at the secondary level (equivalent to grades 7-11). Study outcomes were monthly cannabis use and early cannabis use. Results The association between sex and monthly cannabis use varied significantly among schools after controlling for students' main characteristics and school socioeconomic environment. We found a statistically significant modifying effect of school connectedness on the association between sex and monthly cannabis use. For early cannabis use, we found no modifying effect of school connectedness nor any association with sex. Conclusions Measures to reduce adolescents' cannabis use could be better adapted to local context and more tailored to specific higher-risk groups. School connectedness is a protective factor for cannabis use, although this effect appears stronger for girls than boys.

Silicon (Si) is increasingly recognized as an essential trace element in animals, especially since the identification of mammalian Si transport systems and Si responsive genes not long ago. During many years, however, efforts to gain substantial insight into the biological role of this element in animals have achieved partial success due in part to the unavailability of validated protocols to study Si movement across biological membranes. To circumvent such limitations, we have developed a general transport assay in which cellular Si content was determined by automated electrothermal atomic absorption spectrophotometry. We have found this assay to provide great analytic sensitivity with Si detection thresholds of less than 1 µM, that is, below or very close to the concentration range of animal cells. We have also found this assay to provide valid and cost-effective determinations in Si transport studies while requiring workable quantities of samples. The protocol described here should thus become gold standard toward accelerated progress in the field of Si transport.

Cigarette use and binge drinking are risky behaviors emerging during adolescence. Although many beneficial factors are well documented, studies linking shyness to substance use are somehow conflicting, which may be due to the contribution of moderators. Therefore, the present study has 2 objectives: (a) to prospectively analyze the association between shyness and substance use during adolescence, and (b) to test the moderating role of peer group affiliation on the relationship between shyness and substance use. Participants are 1447 adolescents from the Quebec Longitudinal Study of Child Development, a representative cohort of single-birth children born between 1997 and 1998 in the province of Quebec, Canada. Shyness was assessed at age 12 years. Peer group affiliation, as well as past year cigarette use and binge drinking were assessed at age 15 years. Logistic regressions were used to analyze the data. All analyses were carried out using weighted data accounting for the complex multistage sample design. Results show that shyness negatively predicts the use of tobacco and the occurrence of binge drinking while controlling for confounding variables. However, shyness does not interact with peer group affiliation in predicting substance use. This is the first study that confirms the presence of a negative relationship between shyness and substance use during adolescence over a 3-year period. Results suggest that shyness could exert a beneficial effect against substance use notwithstanding the adolescent's social context. (PsycINFO Database Record

Thanks to new technologies, young people can keep themselves informed, communicate, socialise and perform a host of other activities more easily, online. Adolescence is also a period of vulnerability for the development of eating disorders. This expansion of digital media in the daily lives of adolescents raises questions regarding the long-term implications and the possible impacts of the internet on the evolution and treatment of people with eating disorders.

Cannabis is the most common illicit drug used worldwide and it is used frequently by Canadian teenagers. Cannabis use during adolescence can cause functional and structural changes to the developing brain, leading to damage. Marijuana use in this age group is strongly linked to: cannabis dependence and other substance use disorders; the initiation and maintenance of tobacco smoking; an increased presence of mental illness, including depression, anxiety and psychosis; impaired neurological development and cognitive decline; and diminished school performance and lifetime achievement. Rates of acute medical care and hospitalization for younger children who have ingested cannabis unintentionally are increasing. Ongoing debate concerning cannabis regulation in Canada makes paying close attention to the evidence for its health effects and ensuring that appropriate safeguards are in place, vital public health priorities.

The authors of the published version of this article inadvertently omitted the table note of the Table 2 under the Appendix section. The complete Table 2 is shown in this article].