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Introduction Exposure to green spaces is beneficial to mental health in a variety of ways, ranging from stress reduction to increased attentiveness and elevated selfesteem. The impact of views of greenness, as opposed to direct exposure, has been examined, but the association between self-reported views and depressive symptoms is not known. The purpose of this study is to examine the relationship between views of greenness and Patient Health Questionnaire–9 (PHQ-9) score. Methods Questionnaire responses from 191 participants in the Health, Environment, and Action in Louisville (HEAL) study were examined. Univariate statistical analyses included Mann-Whitney U, Kruskal-Wallis, and Spearman rank tests. Inferential statistical analysis was linear regression. Results Participant satisfaction with residential greenness was significantly associated with reduced PHQ-9 score (partially adjusted: linear coefficient = -0.42; 95% CI: -0.70 – -0.14; fully adjusted: linear coefficient = -0.21; 95% CI: -0.44 – 0.02). Additionally, being satisfied with local greenness was significantly associated with having views of greenness from home (linear coefficient = 1.97; 95% CI: 1.23–2.68). Conclusions Though views of greenness were not directly associated with depression, satisfaction with local greenness was associated with reduced PHQ-9 score, and having views of greenness from home was crudely associated with increased greenness satisfaction. The findings suggest urban greening interventions that focus on greenness satisfaction may be a strategy to reduce depression. Further research is necessary to better understand these relationships.

Introduction Electronic nicotine delivery systems (ENDS) are a relatively new type of nicotine-containing product that has risen greatly in use within the past decade, displacing conventional tobacco products as the dominant source of nicotine exposure by many groups. Among those impacted are large sections of US youth. Though health outcomes associated with ENDS use are still being assessed, several potential harms have been noted in the extant literature. The purpose of this study is to examine which US youth subpopulations are at greatest risk for ENDS ever use and how perceptions pertaining to nicotine-containing products relate to this risk. Methods A nationwide online survey was administered to US youth ENDS users and non-users aged 13-18 years. A total weighted sample of 2501 participants was obtained. Statistical analyses included binomial logistic regression and a likelihood ratio test. Results Of these youth, 1346 (53.8%) reported having ever used an ENDS product. Those most likely to have used ENDS were White males in their late teens. Those who reported ever using a conventional tobacco product were much more likely to have reported ever using ENDS (AOR= 19.96; 95% CI: 15.30-26.05). A number of perceptions related to nicotine-containing products, including product safety and health effects, were significantly associated with an increased likelihood of ENDS use. Conclusions Certain sections of the US youth population have elevated odds of being ENDS ever users. As increasing evidence supports the need to combat ENDS use by youth, effectively targeted education and prevention campaigns will be necessary.