The Clinic: Smoke Weed and Don’t Worry About Schizophrenia

Of all the scare tactics used over the last century to make people afraid of a largely harmless plant, the idea that smoking pot can cause psychotic episodes or even schizophrenia is one of the oldest and most difficult to overcome. Especially in regards to adolescents, whose developing brains may react to THC and other cannabinoids differently than adults.

Unfortunately, while most reefer madness claims — like “marijuana will make men grow breasts” and “smoking pot causes lung cancer” — can be easily debunked, the evidence regarding ganja and schizophrenia has been a bit mixed. Until now.

In a new article published in the scholarly journal Schizophrenia Research, a team from Harvard Medical School found that there’s no reason to draw a link between marijuana use and an increased chance of developing schizophrenia. For the study, 282 subjects were divided into four groups: those with no history of psychosis or drug use (including cannabis); those with no history of psychosis, and heavy marijuana use as adolescents, but no other drug use; those with no history of using any drug (including marijuana) and less than 10 years of illness; and those with a history of heavy marijuana use, and no other drug use during adolescence, prior to psychosis onset.

In all, after collecting information from the subjects’ first, second and third degree relatives, the case histories of more than 4,291 people were taken into account when analyzing the data. Ultimately, family history, not marijuana use, was found to predicate an increased likeliness of schizophrenia.

“The results of the current study suggest that having an increased familial morbid risk for schizophrenia may be the underlying basis for schizophrenia in cannabis users and not cannabis use by itself,” the researchers concluded.

By including separate groups examining non-psychotic cannabis users and non-cannabis users as independent control groups for the first time, the Harvard researchers demonstrated that previous studies showing a increased risk failed to take such factors fully into account.

This explains why the rate of schizophrenia in society has held basically steady since the early 1960’s, while the rate of marijuana smoking has risen precipitously. These results also bolster the findings of a recent government-funded study that showed cannabinoids may actually help prevent schizophrenia.

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