A new study has found that cannabis legalization in Canada has led to a significant increase in schizophrenia cases, particularly among young men.
Researchers analyzed data from over 13.5 million residents of Ontario and found that the number of new cases of schizophrenia associated with cannabis use disorder nearly tripled after legalization. The study also showed that hospital care for cannabis use disorder increased by 270% among young adults aged 19-24 years.
The study’s lead investigator, Dr. Daniel Myran, said that the increasing potency of cannabis and rising regular use are contributing to the growing public health challenge. He warned that just because cannabis is now legal, it doesn’t mean that it’s safe for everyone, particularly younger people.
“This conversation needs to be had,” Myran said. “Alcohol and tobacco may be legal, but they’re not harmless. We need to consider the risks associated with cannabis use, especially among vulnerable populations.”
The study’s findings support mounting evidence of a link between cannabis use and increased risk for psychosis. However, the researchers emphasized that more research is needed to fully understand this association.
The study was published in JAMA Network Open and received funding from the Canadian Institutes of Health Research and ICES.
Source: https://www.medscape.com/viewarticle/has-legalized-cannabis-led-surge-schizophrenia-cases-2025a10002ti?form=fpf