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Teenage Marijuana Use May Hurt Future IQ


Teenage Marijuana Use May Hurt Future IQ
ABC News

August 27, 2012

In a study of more than 1,000 adolescents in New Zealand, those who began habitually smoking marijuana before age 18 showed an eight-point drop in IQ between the ages of 13 and 38, a considerable decline.

Madeline Meier, lead researcher and a post-doctoral associate at Duke University, said that persistent use of marijuana in adolescence appeared to blunt intelligence, attention and memory. More persistent marijuana use was associated with greater cognitive decline.

Of particular worry is the permanence of these effects among people who began smoking marijuana in adolescence. Even after these subjects stopped using marijuana for a year, its adverse effects persisted and some neurological deficits remained. People who did not engage in marijuana smoking until after adolescence showed no adverse effects on intelligence.

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Keywords: teenage, marijuana, hurt, future, IQ

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