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Study Finds No Mental Health Benefits from Cannabis

3/17/2026

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Story summary
  • A Lancet Psychiatry review finds no evidence cannabis treats anxiety, depression, or PTSD.
  • The study is the largest of its kind and urges better cannabinoid research.
  • The Australian Medical Association calls for regulatory oversight and cautions against substituting cannabis for care.
  • The Therapeutic Goods Administration notes anxiety is a reason for prescribing THC products in Australia.
  • Medicinal cannabis may help with epilepsy and pain, but mental health benefits remain unproven.