Marijuana Facts
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The plant Cannabis sativa is the source of both marijuana and hashish. The leaves, flowers, and twigs of the plant are crushed to produce marijuana; its concentrated resin is hashish. Both drugs are usually smoked. Their effects are similar: a state of relaxation, accelerated heart rate, perceived slowing of time, and a sense of heightened hearing, taste, touch, and smell. These effects can be quite different, however, depending on the amount of drug consumed and the circumstances under which it is taken. Marijuana and hashish are not thought to produce psychological dependence except when taken in large daily doses. The drugs can be dangerous, however, especially when smoked before driving. Although the chronic effects are not yet certain, marijuana is probably injurious to the lungs in much the same way that tobacco is. A source of concern is its regular use by children and teenagers, because the intoxication markedly alters thinking and interferes with learning. A consensus exists among physicians and others working with children and adolescents that use is undesirable and may interfere with psychological and possibly physical maturation.
Cannabis has been used as a folk remedy for centuries, but it has no well-established medical use today. Experimental work has been done using its active ingredient, delta-9-tetrahydrocannabinol (THC), for treating alcoholism, seizures, pain, the nausea produced by anticancer medications, and glaucoma. Its usefulness for glaucoma patients seems fairly certain, but its disorienting effects make its possible employment by cancer patients more doubtful.
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