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Published online 1 December 2004 | Nature | doi:10.1038/news041129-7

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Cannabis boosts risk of psychosis

Teens vulnerable to mental problems should abstain, experts warn.

Using cannabis during adolescence or early adulthood increases the risk of developing psychotic symptoms, according to a study that tracked almost 2,500 young people. Crucially, those who are already predisposed to such problems are at a disproportionately greater risk when using the drug.

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