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Marijuana: Effects
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Marijuana cigarettes have been used to treat chemotherapy-induced nausea and vomiting, and research has shown that THC is more quickly absorbed from marijuana smoke than from an oral preparation. However, any antiemetic effects of smoking marijuana may not be consistent because of varying potency, depending on the source of the marijuana contained in the cigarette.
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Marijuana use increases the heart rate as much as 50 percent, depending on the amount of THC. It can cause chest pain in people who have a poor blood supply to the heart - and it produces these effects more rapidly than tobacco smoke does.
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Marijuana provides effective treatment for glaucoma, in which pressure within the eye is abnormally high, and is hypotensive, lowering blood pressure. Marijuana relieves asthma, menstrual pains, the pain of childbirth, and of arthritis and rheumatism, and may have value as an antidepressant. Marijuana encourages and induces sleep. The seeds are used in Chinese medicine as a strong but well-tolerated laxative, especially for constipation in the elderly.
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[M]any teens encounter serious trouble well short of the "gateway." Marijuana is, by itself, a high-risk substance for adolescents. More than adults, they are likely to be victims of automobile accidents caused by marijuana’s impact on judgment and perception. Casual sex, prompted by compromised judgment or marijuana’s disinhibiting effects, leaves them vulnerable not only to unwanted pregnancy but ... to sexually transmitted diseases (STDs).
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