Cognition and Adolescent Health
The purpose of this study is to provide updated information on prevalence and frequency of cannabis use in relation to other forms of substance use in a representative sample of high-school aged adolescents, to evaluate the effect of contingency management on initial 30-day verified cannabis abstinence in adolescents and older adolescents who use cannabis at least weekly and are not seeking treatment, to determine whether there is cognitive dysfunction in cannabis use that persists in the short term (4 days) after use but resolves with extended abstinence (30 days) compared to cannabis users who do not quit and non-using controls and to estimate the rate of cognitive improvement with cannabis abstinence as a function of time since last use and concentration of detectable cannabis metabolites in urine.