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MRC Social, Genetic, and Developmental Psychiatry Centre, Institute of Psychiatry, King's College London
Division of Psychological Medicine, Institute of Psychiatry, King's College London
National Addiction Centre, Institute of Psychiatry, King's College London
Division of Psychological Medicine, Institute of Psychiatry, King's College London, UK
Correspondence: Louise Arseneault, PO 80, Institute of Psychiatry, De Crespigny Park, London SE5 8AF, UK. E-mail: l.arseneault{at}iop.kcl.ac.uk
Declaration of interest L.A. is supported by the Canadian Institute of Health Research; M.C. is supported by the Wellcome Trust and the EJLB Foundation.
Background Controversy remains as to whether cannabis acts as a causal risk factor for schizophrenia or other functional psychotic illnesses.
Aims To examine critically the evidence that cannabis causes psychosis using established criteria of causality.
Method We identified five studies that included a well-defined sample drawn from population-based registers or cohorts and used prospective measures of cannabis use and adult psychosis.
Results On an individual level, cannabis use confers an overall twofold increase in the relative risk for later schizophrenia. At the population level, elimination of cannabis use would reduce the incidence of schizophrenia by approximately 8%, assuming a causal relationship. Cannabis use appears to be neither a sufficient nor a necessary cause for psychosis. It is a component cause, part of a complex constellation of factors leading to psychosis.
Conclusions Cases of psychotic disorder could be prevented by discouraging cannabis use among vulnerable youths. Research is needed to understand the mechanisms by which cannabis causes psychosis.
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| Psychiatric Bulletin | Advances in Psychiatric Treatment | All RCPsych Journals |
