Marijuana, mixture of leaves, stems, and flowering tops of the Indian hemp plant Cannabis sativa, smoked or eaten for its hallucinogenic and pleasure-giving effects. The psychoactive ingredient of marijuana, tetrahydrocannabinol (THC), is concentrated in the flowering tops; hashish, a drug prepared from the plant resin, has about eight times more THC than marijuana. Marijuana grows throughout temperate regions, with the more potent varieties produced in dry, hot, upland climates. Except for limited medical purposes, cultivating …
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showed last 75 words of 331 total
…syndrome to marijuana use, however, has not been established. Like alcohol intoxication, marijuana intoxication impairs reading comprehension, memory, speech, problem-solving ability, and reaction time. The effects on the intellect of long-term use are unknown. Consistent evidence that marijuana induces or causes brain damage does not exist. Medical research has indicated that the drug is effective in relieving some of the symptoms of glaucoma and in treating the nausea induced by cancer chemotherapy and radiation treatments