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NEW YORK — A small study of casual marijuana smokers has turned up evidence of changes in the brain, a possible sign of trouble ahead, researchers say.

[np_storybar title=”Marijuana use by teens linked to permanent brain abnormalities later in life, increased schizophrenia risk: study” link=”http://life.nationalpost.com/2013/07/25/marijuana-use-by-teens-linked-to-permanent-brain-abnormalities-later-in-life-u-s-study/”]

Smoking a few joints with friends growing up may be the furthest thing from harmless for developing young brains, a new U.S. study suggests.

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Teenagers who regularly use cannabis during their adolescent years may cause permanent brain abnormalities by using the drug, and increase their risk of developing serious mental disorders such as schizophrenia, a study published this month in the journal Neuropsychopharmacology, a division of the journal Nature, hints at.