Regular Marijuana Use Boosts Psychosis Risk

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People who use marijuana regularly may be five times more likely to experience psychosis, according to a study published in The Lancet.

Over a six-year period, daily users of high-potency marijuana had a fivefold increased chance of psychosis compared with people who had never used the drug.

The study included 780 people from south London, 410 of whom were being treated for conditions such as schizophrenia and bipolar disorder. Over the study period, the researchers monitored the participants for episodes of psychosis. They also surveyed participants about the frequency of their marijuana use.

The researchers highlighted the importance of asking patients not only about drug use, but also about their frequency of drug use to properly assess their risk. Specifically, the researchers warned about the risk of using the “skunk” variety of marijuana, a powerful type of the drug currently seeing an increase in use.

In England, one in 2,000 people is diagnosed with psychosis annually. The results of the study suggest that almost one quarter of psychosis cases could be prevented if no one used high-potency marijuana.

The study adds to a growing body of evidence tying regular marijuana use to an increased risk of mental health problems.

Regular Marijuana Use May Cause Psychosis
Regular Marijuana Use Boosts Psychosis Risk

A British study released Monday suggested that the risk of psychosis was five times higher for regular users of cannabis, adding to a growing body of evidence linking drug use and mental health disorders.

The six-year study published in the medical journal The Lancet reported on 780 people living in south London, 410 of whom were being treated for conditions including schizophrenia and bipolar disorder.

The report's lead author was Marta Di Forti from the Institute of Psychiatry, Psychology and Neuroscience at King's College London, who warned about the growing use of "skunk"— a powerful type of cannabis.

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