by Kate Anderson
A study published Wednesday found that teens who use cannabis are 11 times more likely to be diagnosed with a psychotic disorder, according to NBC News.
The study was led by researchers from the University of Toronto and examined teenage patients who used cannabis within the last year and those who did not, according to NBC News. When the study was further limited to teens who were sent to the emergency room or hospitalized, it showed a 27-fold increase in the likelihood of being diagnosed with psychotic illness.
“I think that there’s enough evidence out there for us to give recommendations that teens probably shouldn’t be using cannabis,” Andre McDonald, a postdoctoral research fellow at McMaster University and lead author of the study, said, according to NBC News. “If we can somehow ask teens to delay their use until their brain has developed a little further, I think that would be good for public health.”
While the research does not prove that cannabis use by teens causes psychosis, Dr. Leslie Hulvershorn, a child psychiatrist who was not involved with the study, argued it was unlikely that the teens were already predisposed to these kinds of mental health issues, according to NBC News. The study noted that the risk of psychosis did not spike for users between the ages of 20 and 33 and Dr. Kevin Gray, a professor of psychiatry at the Medical University of South Carolina who was not a part of the study, told NBC News that the increase in risk of psychosis likely had to do with brain development at different stages of life.
“There’s something about that stage of brain development that we haven’t yet fully characterized — where there’s a window of time where cannabis use may increase the risk of psychosis,” Gray said. “This study really puts a fine point on delaying cannabis use until your 20s may mitigate one of the most potentially serious risks.”
Another study from July 2023 found that marijuana addiction made individuals four times more likely to later be diagnosed with bipolar disorder with psychotic symptoms and two times more likely to be diagnosed with depression. Recreational marijuana use has been legalized in 24 states and Washington D.C., and 13 states have legalized the substance for medical use, according to CBS News.
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Kate Anderson is a reporter at Daily Caller News Foundation.
