Association Between Continued Cannabis Use and Risk of Relapse in First-Episode Psychosis

Cannabis use after first-episode psychosis is associated with poor outcomes, but the causal nature of this association is unclear.To examine the precise nature of the association between continued cannabis use after the onset of psychosis and risk of relapse of psychosis.This prospective cohort study followed up for at least 2 years after the onset of psychosis 220 patients who presented to psychiatric services in South London, England, from...