Researchers Question Medical Marijuana

While 23 states and Washington, DC have passed laws permitting medical marijuana use for Alzheimer's disease, epilepsy, lupus and Parkinson's disease, among others, pot has not been proven to work for many illnesses, according to a review in JAMA.

The strongest evidence exists for use for chronic pain and for muscle stiffness in multiple sclerosis, according to researchers. The evidence for many other conditions, including anxiety, sleep disorders, and Tourette's syndrome is weaker.

In a companion editorial, Deepak Cyril D'Souza and Mohini Ranganathan, psychiatrists from Yale University suggest that enthusiasm for medical marijuana has outpaced rigorous research, noting that marijuana can be addictive and questions remain about long-term health effects of use.


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