Little is known about the efficacy and tolerability of oral THC versus smoked MJ in a clinically relevant population. Additionally, it is not clear how THC's effects vary as a function of the duration of treatment or the patient's current patterns of smoked MJ use. This study directly compares 3 doses of smoked marijuana and 3 doses of Marinol across a range of behavioral measures in HIV infected marijuana smokers. Outcome measures will include analysis of food intake, body composition, mood, physical symptoms (e.g., nausea, stomach pain), psychomotor task performance, and sleep.
Inclusion Criteria * HIV infected * Smoke marijuana * Taking HIV medications Exclusion criteria * Naive marijuana smokers * People with history of respiratory/pulmonary disease