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Teenage pot smoking may lower IQ – for life

Posted Aug 29 2012 6:46am
Chronic use of the chronic before age of 18 can cause “lasting harm to a person’s

intelligence, attention and memory” – and quitting pot later in life doesn’t reverse

the damage, says daunting new research out of New Zealand.

The study, which followed 1,037 Kiwis for nearly 40 years, found that adolescents who

smoked marijuana persistently for years showed declines of eight IQ points when their

scores were tabulated at age 13 and then at 38. Teens who got stoned regularly all

scored significantly worse than their sober counterparts on tests measuring memory,

reasoning and processing speed, with family and friends of users corroborating the

findings anecdotally.
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