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Abuse of marijuana increases risk of psychosis up to 159 percent: Study 5 Jul, 2017

Abuse of marijuana increases risk of psychosis up to 159 percent: Study

Using marijuana between once a week and every day increases the risk of a psychosis-like experience by 159 percent, the U.K. Daily Mail reported, citing a new study.

Researchers from the University of Montreal followed 4,000 13-year-olds for four years, having participants complete questionnaires about substance abuse and any psychotic experiences.

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