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Even after years of clinical and laboratory trials, the jury is still out on the health effects of marijuana.
That was the consensus of a panel of experts who reviewed the morass of scientific literature on cannabinoids for the National Academy of Sciences' report Marijuana and Health, released in late February. Although a variety of short-term effects were evident to panel members, they were unable to make conclusions about how prolonged use of the drug would affect health and thus recommended "a greatly intensified and comprehensive program of research." Similar recommendations and conclusions were reached by Britain's Advisory Council on the Misuse of Drugs in a report released in March.
True enough, US support of research has been sparse (about $4 million a year) on this, the most widely used illegal drug in the country. But the fact is that because of marijuana's known efficacy as an antiemetic, it has,
Macek C. THC: 'transitional drug' for emesis therapy? JAMA. 1982;247(19):2648–2655. doi:10.1001/jama.1982.03320440004002
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