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This study tested whether opiate dependence, tobacco smoking, or their combination accompanied impaired performance on the gambling task (GT), which tests decision-making. GT previously detected impairments in patients with lesions of the ventromedial prefrontal cortex and in substance abusers. Four groups were matched on demographic characteristics and intelligence: methadone-maintained smokers (n=9)...
Rationale: Chronic marijuana use has been associated with impairments of learning, memory, and executive functions. Little is known, however, about the effects of marijuana use on other cognitive domains, such as decision-making, which are thought to play an important role in addiction and drug abuse. Objectives: The purpose of the present study was to determine if long-term heavy marijuana users...
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