BMJ  2005;330 (1 January), doi:10.1136/bmj.330.7481.0

Risk of psychosis is linked to frequency of cannabis use

Young cannabis users are more likely than non-users to develop psychosis, particularly if they also have other risk factors. Following 2437 German people aged 14-24 for four years, Henquet and colleagues (p 11) found a dose-response relation between frequency of cannabis use and risk of psychosis. The effect of cannabis use was much stronger in those with predisposition for psychosis at baseline than in those without (adjusted difference in risk 23.8% and 5.6%, respectively).

Credit: SIPA PRESS/REX


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Relevant Article

Prospective cohort study of cannabis use, predisposition for psychosis, and psychotic symptoms in young people
Cécile Henquet, Lydia Krabbendam, Janneke Spauwen, Charles Kaplan, Roselind Lieb, Hans-Ulrich Wittchen, and Jim van Os
BMJ 2005 330: 11. [Abstract] [Full Text] [PDF]

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