Behavioral Economic Analysis of Demand for Marijuana

Eligibility Details: Inclusion Criteria: - marijuana use at least 8 times in the past month on average and at least monthly for the past 6 months - English-speaking - negative urine toxicology screen for drugs other than marijuana - non-treatment seeking - purchase of marijuana at least twice in the past 6 months to confirm familiarity with the construct to be measured Exclusion Criteria: - positive pregnancy test - nursing - inability to use contraception during the study - poor physical health - positive breath alcohol concentration - diagnosis of a current affective disorder, psychosis, and panic disorder - self-report of past serious adverse reaction to marijuana - current psychotropic drug use - smoking more than 20 tobacco cigarettes per day - inability to abstain from marijuana for 15 hours - body mass index outside 18.5-30 kg/m2 range