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| | --- Reply above this line to comment on this post --- Persistent marijuana use before age 18 may cause lasting harm, including a drop in IQ, a new study shows. Among a long-range study cohort of more than 1,000 New Zealanders, individuals who started using cannabis in adolescence and used it for years afterward showed an average decline in IQ of 8 points when their age 13 and age 38 IQ tests were compared. “Somebody who loses 8 IQ points as an adolescent may be disadvantaged compared to their same-age peers for years to come,” says Madeline Meier, post-doctoral researcher at Duke University. Full story at Futurity. More research news from top universities. Photo credit: Fotolia | | | |
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