Predictors of cannabis use in men with and without psychosis

BackgroundFactors associated with cannabis use among people with psychosis are not well understood.AimsTo examine whether people with psychosis and age-matched controls modified cannabis use in response to recent experiences.MethodThis study predicted 4 weeks of cannabis use prospectively, using expectancies derived from recent occasions of use.ResultsPeople with psychosis used cannabis less frequently than controls, but had more cannabis-related problems. More negative cannabis expectancies resulted in less frequent cannabis use over Follow-up. The psychosis group was more likely to moderate cannabis use after negative effects than controls.ConclusionsResults offer optimism about abilities of people with psychosis to moderate cannabis use in the short term.