Columbia University Medical Center
NewYork-Presbyterian Hospital The University Hospital of Columbia and Cornell
Evidence on Marijuana's Health Effects is Hazy at Best
March 4, 2014

"We should have been doing a lot more research to find out just how useful it is, how it affects the brain, et cetera, et cetera," according to Dr. Herbert Kleber, a Columbia University psychiatrist and drug abuse researcher.

But he says it's been hard to study the effects of Cannabis sativa, the plant that produces marijuana.

 Listen now:


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