Adolescent alcohol and cannabis use pose significant developmental risks. This study examined internalizing and externalizing problems as risk factors and prospective self as a protective factor in relation to alcohol and cannabis use. Self-report data were collected from a diverse sample (N = 2017) of 15–17-year-olds using the Youth Self Report (YSR) for behavior issues and prospective self, a factor-derived variable reflecting future orientation, resistance to peer influence, and academic aspirations. Participants reported on 15 health risk behaviors, including alcohol and cannabis use. Weighted linear regressions evaluated associations between risk and protective factors and substance use. Results indicated a higher externalizing behavior was linked to increased alcohol and cannabis use, while a higher prospective self and internalizing behavior were linked to reduced alcohol use. Higher prospective self was associated with less cannabis use. Interaction terms were largely non-significant, except for the interaction between prospective self and internalizing behavior, where higher internalizing problems and high prospective self were linked to increased cannabis use. The findings highlight the importance of prospective self, especially at clinically elevated levels of behavior problems, and recommend further exploration of the unexpected positive associations between internalizing behavior and prospective self with cannabis use.

Adolescent alcohol and marijuana use pose significant developmental risks. This study examined internalizing and externalizing problems as risk factors and prospective self as a protective factor in relation to alcohol and marijuana use. Self-report data were collected from a diverse sample (N = 2017) of 15-17-year-olds using the Youth Self Report (YSR) for behavior issues and Prospective Self, a factor derived variable reflecting future orientation, resistance to peer influence, and academic aspirations. Participants reported on 15 health risk behaviors, including alcohol and marijuana use. Weighted linear regressions evaluated associations between risk and protective factors and substance use. Model 1 included sociodemographic covariates. Model 2 added risk and protective factors, and Model 3 included interactions of internalizing and externalizing behaviors with prospective self. Results indicated higher externalizing behavior was linked to increased alcohol and marijuana use, while higher prospective self and internalizing behavior were linked to reduced alcohol use. Higher prospective self was associated with less marijuana use. Interaction terms were largely non-significant, except for the interaction between prospective self and internalizing behavior, where higher internalizing problems and high prospective self were linked to increased marijuana use. Findings highlight the importance of prospective self, especially at clinically elevated levels of behavior problems, and suggest further exploration of the unexpected positive association between internalizing behavior and prospective self with marijuana use.

Objective: We investigated the links between pubertal timing and tempo and the onset of cannabis, alcohol, and tobacco use among middle schoolers in Appalachian communities. Methods: School surveys were administered to middle school students of the 6th grade and continuing through the spring of the 8th grade (n = 2,587; 49.4% boys), beginning in the fall at six-month intervals. Youth self-reported on their pubertal development and substance use. We examined the influence of baseline levels and rate of growth in puberty as predictors of substance use onset with Latent Growth Curve Modeling (LGCM), stratified by sex/gender. Results: Our findings show that early pubertal timing was associated with an increased likelihood for onset of cannabis and alcohol use for boys, but not girls; pubertal tempo was not associated with onset. Conclusion: Early pubertal development may be a risk factor for early-onset substance use for boys. Prevention programming beginning in the first year of middle school is recommended.