TEENAGERS using cannabis are causing long-lasting damage to their developing brains, says a new Canadian study, published in the American Journal of Psychiatry.
The study tracked and tested 3,800 teenagers from 31 different Canadian schools over four years, looking at drug and drinking habits.
Their brain skills were also tested every year in school using computer-based cognitive tests.
Cannabis users had more impairment on working memory, reasoning and their ability to control their behaviour than alcohol users, authors said.
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