A scientist leading the largest marijuana study in history says it’s ‘5x stronger’ than in 1980 — but there’s a catch

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  • An increasing number of Americans live in states where
    recreational marijuana is legal.
  • CU Boulder psychiatry professor Christian Hopfer is
    helping lead one of the largest and most long-term studies of
    marijuana in history.
  • He says marijuana has gotten up to 5 times stronger
    since the 1980s, but

     tracking THC potency
    over time can be tricky.

One in five Americans lives in

... read more at: http://www.businessinsider.com/marijuana-has-gotten-stronger-more-potent-research-science-2017-10