Predictors of cannabis use in men with and without psychosis

Abstract

Background Factors associated with cannabis use among people with psychosis are not well understood. Aims To examine whether people with psychosis and age-matched controls modified cannabis use in response to recent experiences. Method This study predicted 4 weeks of cannabis use prospectively, using expectancies derived from recent occasions of use. Results People 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. Conclusions Results offer optimism about abilities of people with psychosis to moderate cannabis use in the short term.