Marijuana Use May Raise Risk of Psychosis Relapse

Smoking marijuana may increase the risk of experiencing an episode of psychosis, or a break with reality, in people who have already had such an episode, according to a new study.

In the study, researchers looked at about 200 patients in England who had been diagnosed with psychosis at least two years before the start of the study, and asked them about theirmarijuana use. The researchers found that those who used marijuana during the two years after they experienced their first episode of psychosis had a 13 percent higher chance of experiencing another episode of psychosis during this time, compared with people who did not smoke marijuana during the first two years after being diagnosed.

However, it is important to put these estimates into context, said study co-author Sagnik Bhattacharyya, a researcher who studies psychosis at King's College London. "Patients with psychosis already have a high risk of relapse...

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