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    Copyright © 2014 The International Neuropsychological Society.To assess recovery of cognitive effects, we investigated neuropsychological performance after 1 month of monitored abstinence in teens with histories of heavy episodic drinking, protracted marijuana use, or concomitant use of alcohol and marijuana. Adolescents with histories of heavy episodic drinking, marijuana use, both heavy alcohol and marijuana use, and socio-demographically similar control teens completed a neuropsychological ba…Read more