Although a growing number of states have approved post-traumatic stress disorder (PTSD) as a qualifying condition for medical marijuana use, new research shows that the drug may actually worsen symptoms and increase violent behavior.

A large observational study of more 2000 participants who were admitted to specialized Veterans Administration treatment programs for PTSD showed that those who never used marijuana had significantly lower symptom severity 4 months later than those who continued or started use after treatment. Veterans who were using marijuana at treatment admission but quit after discharge (“stoppers”) also had significantly lower levels of PTSD symptoms at follow-up.

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