Abstract

IntroductionAs prevalence of marijuana use increases, it is important that we better understand how factors like gender, cigarette use, and depression are related to marijuana use during adolescence and young adulthood. We examined longitudinal relationships among these variables in adolescents moving into young adulthood who were studied longitudinally for six years. Methods1263 individuals were included in the study. Participants were oversampled for ever-smoking a cigarette at baseline, when they were 15–16years old. Frequency of cigarette smoking and marijuana use, as well as depression symptoms, were assessed at baseline, 6, 15, 24, 60 and 72months. ResultsCigarette use frequency and depression symptoms were associated with frequency of marijuana use (p-values<.001), particularly in adolescence, but there were important gender differences in these relationships. Specifically, symptoms of depression were related to marijuana use frequency among males (p<.001), but not females (p=.62). In addition, frequency of marijuana use was associated with increased cigarette use frequency, especially among males who had higher symptoms of depression (p<.001). However, this effect was not seen among females. Exploratory analyses suggested that relationships between frequency of use and depression are specific to marijuana, not cigarettes. ConclusionsMarijuana use is strongly related to depression symptoms and cigarette use frequency in males, indicating that in males these detrimental factors converge, whereas in females they do not. Gender differences in the factors related to marijuana use may mean that there are different risks for and consequences from use and have implications for prevention and intervention efforts.

Highlights

  • As prevalence of marijuana use increases, it is important that we better understand how factors like gender, cigarette use, and depression are related to marijuana use during adolescence and young adulthood

  • Exploratory analyses suggested relationships between frequency of use and depression are specific to marijuana, not cigarettes

  • Marijuana use is strongly related to depression symptoms and cigarette use frequency in males, indicating that in males these detrimental factors converge, whereas in females they do not

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Summary

Introduction

As prevalence of marijuana use increases, it is important that we better understand how factors like gender, cigarette use, and depression are related to marijuana use during adolescence and young adulthood. Two commonly used substances among adolescents and young adults (Johnston et al, 2014) are often used concurrently (Kandel & Yamaguchi, 1993; Patton et al, 2006; Prince van Leeuwen et al, 2013; Rigotti et al, 2000; Silins et al, 2013), leading to escalating use and severity of dependence (Degenhardt et al, 2001; Kandel & Yamaguchi, 1993; Korhonen et al, 2008; Lynskey et al, 1998; Mathers et al, 2006; Patton et al, 2006). Females “catch up” over time to males in marijuana use, and gender differences in amount of use may diminish in young adulthood (Mahalik et al, 2013)

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