Next, we examined reports of vaginal sex, as well as two illegal "risk" behaviors, cocaine/methamphetamine use and marijuana use, one legal "risk" behavior, alcohol use, and one "neutral" behavior, taking a walk, over the 12 weeks of the study.
It has also been used to predict behaviors and intentions related to cigarette, alcohol and marijuana use, and sexual behaviors [ 35– 40].
In a unique prevention study testing for gene environment interaction associated with the serotonin transporter gene, Brody and colleagues (2009 b ) found that youth carrying the short allele were more likely to initiate high-risk behavior (including alcohol and marijuana use, as well as sexual behavior) over time if they were in the control condition rather than the prevention condition.
Previous research has established the predictive utility of this framework for the explanation of adolescent variation in an array of problem behaviors including drinking, problem drinking, marijuana use, delinquency, and risky sexual behavior (Costa et al., 1995; Donovan, 1996; Donovan et al., 1999; Jessor and Jessor, 1977).
Here, we use nationally representative data to show that both sleep behavior and marijuana use spread through social networks and mediation analyses suggest that an adolescent's sleep behavior influences a friend's marijuana usage via the impact on the friend's sleep behavior.
Moreover, in keeping with the baseline analyses described above, alter's sleep behavior is significantly associated with ego's sleep behavior (p = 0.001), and ego's marijuana use is significantly associated with ego's sleep behavior, controlling for alter's sleep behavior (p = 0.001).
All youth were queried about their substance use behavior (alcohol, marijuana, tobacco, illicit hard drug use) and individual-level risk factors (school involvement, employment, self-esteem, level of externalizing behaviors).
The police groups also make a number of additional controversial claims that marijuana use itself leads to violent behavior, suicidal thoughts and interest in harder drugs.
The survey assessed the following factors: sociodemographics, tobacco use, alcohol and marijuana use, knowledge of HIV/AIDS, sexual behavior, perceived risk of smoking, and activity involvement.
Findings suggest that problem drinking and marijuana use, mediate HIV sexual risk behaviors in men with histories of CSA.
