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Skunk poses higher risk of psychosis than traditional hash

BMJ 2009; 339 doi: https://doi.org/10.1136/bmj.b5206 (Published 02 December 2009) Cite this as: BMJ 2009;339:b5206
  1. Jacqui Wise
  1. 1London

    The risk of psychosis is much greater with the more potent skunk form of cannabis than with traditional hash, researchers from the Institute of Psychiatry in London have concluded.

    Their case-controlled study found that people who smoke skunk or sinsemilla are almost seven times as likely to have psychotic illnesses such as schizophrenia than people who use ordinary cannabis (British Journal of Psychiatry 2009;195:488-91, doi:10.1192/bjp.bp.109.064220).

    Information on cannabis use was collected from 280 cases of patients presenting with a first episode of psychosis to the South London and Maudsley NHS Foundation Trust and from 174 healthy controls recruited from the local population. The mean age of the patients was …

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