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Is Marijuana Effective Medicine?

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 (Justin Sullivan/Getty Images)

Twenty-three states have legalized medical marijuana, and some patients who use it say it's effective in treating chronic pain, arthritis, epilepsy, PTSD, cancer and other illnesses. But marijuana is a federally controlled substance. That makes it difficult for researchers to test its efficacy and for patients to decide about treatment. We discuss the science and politics of medical cannabis research.


Timmen Cermak, psychiatrist and past president of the California Society of Addiction Medicine

Tamar Todd, director of marijuana law and policy at the Drug Policy Alliance

Suzanne Sisley, assistant professor of internal medicine/psychiatry at the University of Arizona College of Medicine

Igor Grant, professor and chair of the Department of Psychiatry at the UC San Diego School of Medicine and director of UC's Center for Medicinal Cannabis Research