Given the prevalence of alcohol and cannabis co-use among college students, prevention for co-use is crucial. We examined hypothetical receptiveness to substance-specific interventions among students who reported co-use. Students who use alcohol and cannabis were more receptive to alcohol interventions than cannabis interventions. Campus…

Background: To determine if school engagement is a viable target for early prevention of adolescent substance use, this study investigated whether school engagement in early adolescence (ages 12-14) is a cause of alcohol and cannabis use during middle to late adolescence (ages 15-19). Methods: To facilitate causal inference, inverse probability of…

This experimental 2 x 4 ANOVA study addressed the effects of marijuana-based prevention messages delivered to adult college students. The study examined the variables of sex assigned at birth, by prevention messages to determine the impact of media messages to influence internalized beliefs about marijuana. This study is unique in that it focused…

Non-medical prescription drug use (NMPDU) is common among adolescents and young adults (AYAs) nationwide, with 14.4% reporting misuse in the past year. Little is known about characteristics of college students using NMPDU, including other substance use, such as hookah and tobacco, gender identity, and self-efficacy. The purpose of this study was…

Iceland has witnessed a dramatic decline in adolescent substance use that may be partly the result of efforts related to the Icelandic prevention model (IPM). We sought to test risk and protective factor assumptions of the IPM using a prospective cohort study with 12 months separating baseline from follow-up. Participants were students in grades 8…

A primary community prevention approach in Iceland was associated with strong reductions of substance use in adolescents. Two years into the implementation of this prevention model in Chile, the aim of this study was to assess changes in the prevalence of adolescent alcohol and cannabis use and to discuss the impact of the COVID-19 pandemic on the…

Reducing youth cannabis use in Canada is a public health priority with schools of interest as a potential modifier of behavior and as a venue for prevention programming. This work aimed to provide a basis for future policy and programming by evaluating pre-legalization cannabis use change patterns in schools and the impact of school…

Objective: With medical and recreational marijuana legislation expanding throughout the country, the need to educate high-risk populations is evident. The purpose of this study was to assess college students' perceptions of health communication messages comparing primary and secondary prevention messages concerning marijuana. Participants:…

Objective: Cannabis policies are rapidly evolving in the US. This study's purpose was to examine relationships between cannabis harm perceptions, substance use, and demographic characteristics on attitudes toward cannabis policies. Participants: Participants were 619 undergraduate students in a Mid-Atlantic state where cannabis use was illegal.…

We analyze the interaction between Marijuana and Alcohol as correlates of property crimes among Mexican adolescents. Data were drawn from two waves of a Mexican national survey of public high school students in Mexico. A complementary log-log multilevel regression was fitted separately for each survey year, controlling for neighborhood, school,…

The aim of this study was to assess the prevalence of cannabis and amphetamine use and associated factors among adolescents in nine African countries. We analyzed cross-sectional data from 25,372 adolescents (mean age 14.3 years, SD = 1.6) from nine African countries that participated in the Global School-Based Student Health Survey (GSHS) in…

The purpose of this study was to determine the frequency of marijuana use and its impact on academic outcomes as measured by student GPA within Coalition for Healthy and Safe Campus Communities' (CHASCo) member institutions over a 5-year period. Additionally, the purpose of the study was to determine if there were differences in marijuana use…

The purpose of this study was to determine the frequency of marijuana use and its impact on academic outcomes as measured by student GPA within Coalition for Healthy and Safe Campus Communities' (CHASCo) member institutions over a 5-year period. Additionally, the purpose of the study was to determine if there were differences in marijuana use…

The purpose of this study was to determine the frequency of marijuana use and its impact on academic outcomes as measured by student GPA within Coalition for Healthy and Safe Campus Communities' (CHASCo) member institutions over a 5-year period. Additionally, the purpose of the study was to determine if there were differences in marijuana use…

Background: Given ever-reducing budgets of community and school substance use prevention programs, there is a call for identifying the first substance in the sequence leading to polydrug use. Methods: Examining data from a nationally representative sample of 2835 United States 12th graders, we sought to determine (1) the first substance…