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The objective was to estimate the prevalence of polydrug use of tobacco and cannabis and to see its relationship with self-perceived health and mood state in adolescents from Central Catalonia in the 2019-2020 academic year. A cross-sectional study was carried out with a sample of 7,319 students, who answered a self-administered questionnaire. The dependent variables were the polydrug use of tobacco and cannabis and polydrug use of tobacco and high-risk cannabis. The main independent variables were self-perceived health status and mood state. Frequencies and percentages were analyzed for the prevalence analysis, and the Chi-square test was used. Poisson regression models were adjusted with robust variance, obtaining Prevalence Ratios. The prevalence of polydrug use of tobacco and cannabis was 3.5% and polydrug use of tobacco and high-risk cannabis was 2.5%. In boys, attending higher academic courses (4th of ESO (aPR: 3.88; 95% CI: 2.14-7.05) vs. CFGM (aPR: 8.67; CI95%: 4.51-16.67), having worse self-perceived health (aPR: 4.79; CI95%: 3.24-7.08) and worse mood state (aPR: 1.47; CI95%: 1.05-2.08) act as factors associated with polydrug use of tobacco and cannabis. The results for girls, and risky use of cannabis follow a similar pattern. Among the main conclusions we observe is that there are no differences in self-perceived health and mood state when comparing polydrug use of tobacco and cannabis and polydrug use of tobacco and high-risk cannabis, so risk reduction strategies must be applied whether the use of cannabis is occasional or problematic.

Objective: To determine the predisposition to use roll-your-own (RYO) cigarettes and the beliefs about RYO cigarettes of all the students of 3°-4° of ESO during the years 2016-17 and 2018-19. A cross-sectional study., Setting: Bisaura High School from Sant Quirze de Besora. Primary Health Care in the Catalan Health Institute, Catalunya, Spain., Participants: 111 3rd and 4th of ESO (14-16 years)., Main Measurements: Dependent variables used were future intentions of smoking and beliefs regarding RYO cigarettes. Independent variables were sex, course and ever smoked. The prevalence of the different dependent variables was described and compared according to the different independent variables with Pearson's Khi-square test., Results: 26.6% of the adolescents intended to smoke in the future of which 17.4% intended to smoke RYO cigarettes and 13.8% manufactured cigarettes (MC). Around 30% of adolescents express at least one wrong belief regarding RYO cigarettes. For example, the 26.7% believed that smoking RYO cigarettes generated less addiction than MC and the 32.1% that was less harmful. Those who had smoked at some time in their life had a greater intention to smoke in the future (54.5%), to smoke MC (27.3%) and RYO cigarettes (40.9%) than those who had never smoked (7.7%, 4.6% and 1.5% respectively) (p<0.005). Some misconceptions differed depending on whether adolescents had ever smoked in life, sex and course. The boys believed that smoking RYO cigarettes was more natural than smoking MC (p<0.005)., Conclusions: Educational activities to improve the information that young people have regarding RYO cigarettes are needed., (Copyright © 2021 The Author(s). Publicado por Elsevier España, S.L.U. All rights reserved.)