Cannabis Use in Early Adolescence Especially Neurotoxic

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Chronic cannabis use that starts before age 15 may have a more deleterious effect on cognitive functioning than chronic use that starts later, new research shows.

A study conducted by Brazilian investigators from the Federal University of Sao Paulo showed that early-onset (before age 15 years) chronic cannabis users had significantly poorer executive functioning than late-onset (after age 15 years) users.

“Our findings indicate that early-onset chronic cannabis users are cognitively impaired compared with controls, suggesting that early exposure to cannabis is associated with more adverse effects on the brain. These results are in line with previous studies examining cognitive effects associated with early cannabis exposure,” the authors, led by Maria Alice Fontes, PhD, write.

The study is published in the June issue of the British Journal of Psychiatry…….

By Caroline Cassels
Medscape Medical News
http://www.medscape.com/viewarticle/744783

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