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Two papers in the Journal this week focus on the potential impact of cannabis use on mental health outcomes. Di Forti et al (pp. 488–491) examined the risk of psychosis associated with use of high-potency cannabis. They found that individuals presenting with a first episode of psychosis were no more likely than local population controls to have ever taken cannabis but the former were more likely to have taken high-potency cannabis. Price et al (pp. 492–497) utilised data from a longitudinal study of men conscripted for military service in Sweden and found that although cannabis use was associated with an elevated risk of suicide, adjustment for markers of psychological and behavioural problems eliminated the association.