Bok
01-14-2013, 09:52 PM
Cannabis rots your brain -- or does it? Last year, a paper published in Proceedings of the National Academy of Sciences ( PNAS ) suggested that people who used cannabis heavily as teenagers saw their IQs fall by middle age . But a study published today -- also in PNAS -- says that factors unrelated to cannabis use are to blame for the effect. Nature explores the competing claims.
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