As states loosen their laws around limited marijuana use, raising concerns that it could cause an increase in use by teenagers, recent studies have found that marijuana dependency among teens can change their brains for the long term. Sion Kim Harris, HMS assistant professor of pediatrics at Boston Children’s Hospital; John Knight, HMS associate professor of pediatrics at Boston Children’s Hospital; and Lester Grinspoon, HMS associate professor of psychiatry, emeritus, are quoted.
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