INTRODUCTION Marijuana - often called pot, grass, reefer, weed, herb, mary jane, or mj - is the Nation's most commonly used illicit drug. More than 83 million Americans (37 percent) age 12 and older have tried marijuana at least once, according to the 2001 National Household Survey on Drug Abuse (NHSDA).2 The major active chemical in marijuana is delta-9-tetrahydrocannabinol (THC), which causes the mind-altering effects of marijuana intoxication. The amount of THC (which is also the psychoactive ingredient in hashish) determines the potency and, therefore, the effects of marijuana.1 ...
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