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CNN's Documentary on Marijuana w/Dr. Carl Hart

Not Your Father's Weed? Marijuana Potency Stronger Than Ever
August 9, 2013 - August 12, 2013

"There have always been high-THC content cigarettes around," says Carl Hart, a neuroscientist at Columbia University who studies the physical effects of cannabis and other drugs. "The modest increases that we see today are not as concerning as has been made out to be."

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