- Chronic cannabis use is linked to a higher incidence of schizophrenia, clinical depression, and bipolar disorder.
- A new longitudinal study in Denmark showed that people with cannabis use disorder were almost twice as likely to be diagnosed with clinical depression.
- People with cannabis use disorder were up to four times as likely to be diagnosed with bipolar disorder with psychotic symptoms.
- The study did not determine whether cannabis use induces psychosis or if those prone to mental illness are more likely to be heavy users.
- More research is needed to determine the long-term effects of cannabis use.
Cannabis Is Linked to Mental Illness
A major new study shows that people who abuse the drug are more likely to be diagnosed with depression and bipolar disorder.
Susan Pinker
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