A study this week reported an association between people’s medical records listing cannabis use disorder and both schizophrenia diagnoses and psychosis — but experts emphasized the data should not be used to draw causal conclusions about cannabis use and these risks.
In a study published in JAMA Network Open, the authors reported that the proportion of people with a new diagnosis of schizophrenia who had cannabis use disorder listed in their record increased after cannabis was legalized in Canada. The rates of nonspecified psychosis also increased during this time among people with this label in their record, said Dr. Daniel T. Myran, the lead author and a researcher at the Ottawa Hospital Research Institute.
