Cannabis use disorder, also known as marijuana addiction, was strongly tied to psychiatric problems, including psychotic symptoms and bipolar disorder, in a population-based study of Danish citizens’ medical records from 1995 to 2021.
The study, which analyzed data of about 6.6 million people aged 16 and up, was conducted by Dr. Oskar Hougaard Jefsen of Aarhus University and his colleagues. Individuals with prior diagnoses of cannabis use disorder were up to four times as likely to be diagnosed later on with bipolar disorder and psychotic symptoms, the study found.
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