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Medical marijuana: What does science say?

More states are legalizing medical marijuana but Dr. Margaret Haney, director of the Marijuana Research Laboratory at Columbia University, tells CBS News' Kera Rennert that scienti... More More states are legalizing medical marijuana but Dr. Margaret Haney, director of the Marijuana Research Laboratory at Columbia University, tells CBS News' Kera Rennert that scientific evidence for the drug's medical benefits is lacking. Less

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