This study will examine the acute effects of cannabis on various aspects of memory. Eligible
participants will complete a drug screen followed by baseline measures of cannabis
consumption patterns, level of intoxication, euphoria, anxiety, stress, and verbal
intelligence. Next, participants will be randomly assigned to inhale vapor from cannabis
containing 20mg THC or placebo; both cannabis and placebo will be obtained from the National
Institute on Drug Abuse (NIDA). Participants will complete a battery of memory tests
including tests of prospective, verbal, visuospatial, autobiographical, source, verbal
working, visuospatial working, false, and temporal order memory. Memory tests will be
completed across two blocks in a counterbalanced order. Ratings of intoxication, euphoria,
anxiety, and stress will be obtained three additional times after drug/placebo
administration. The investigators hypothesize that participants who are randomly assigned to
inhale cannabis vapor will perform worse on all memory tests than participants who inhale the
placebo.