title: Marijuana effects and behavioral contingencies.
mesh_terms: D000328:Adult; D013759:Dronabinol / Q000494:pharmacology*; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000523:psychology*; D010919:Placebos; D012016:Reference Values; D013997:Time Factors; D014937:Work
chemical_list: D010919:Placebos; D013759:Dronabinol