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Published online 27 July 2007 | Nature | doi:10.1038/news070723-11
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Medical opinion comes full circle on cannabis dangers
Frequent use more than doubles psychosis risk, says new large-scale analysis.
Frequent cannabis use more than doubles the risk of developing psychotic illnesses such as schizophrenia, according to the most rigorous analysis of the evidence to date.
The finding, which comes from a new study that combines results from 35 previous surveys, represents a significant U-turn from previous suggestions that cannabis is harmless to mental health.
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