Word: marijuana
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...turns out that the study of marijuana's health effects is at once more complex and less advanced than you might imagine. "Interpretations [of marijuana research] may tell more about [one's] own biases than the data," writes Mitch Earleywine in Understanding Marijuana: A New Look at the Scientific Evidence, published in August by Oxford. For example: "Prohibitionists might mention that THC [delta-9 tetra-hydrocannabinol, the smile-producing chemical in pot] often appears in the blood of people in auto accidents. Yet they might omit the fact that most of these people also drank alcohol. Antiprohibitionists might cite...
...science of marijuana--especially its potential medical uses--is malleable because it's so young and so contradictory. Although preliminary data are promising, scientists haven't definitively shown that the drug can safely treat nausea or pain or anything, really. Some experts claim the U.S. government has sabotaged medical-marijuana research, and there is evidence to support them. Even so, in the past few years scientists have made rapid advances in their basic understanding of how Cannabis sativa works. By 1993, researchers had found the body's two known receptors for cannabinoids, the psychoactive chemicals in the plant...
...much new research has appeared that in November the Journal of Clinical Pharmacology and the National Institute on Drug Abuse will publish a 100-page supplement devoted entirely to marijuana. The Journal gave Time an advance look; it's a comprehensive review that will annoy both sides in the drug war. You won't find clear evidence that pot is good or evil, but the research sheds light on some of the most important questions surrounding the drug...
...instance) and directly (by affecting circulation, for example). A paper published last year in the journal Angiology found 10 odd cases in France of heavy herbe smokers who developed ischemia (an insufficient blood supply) in their limbs, leading in four cases to amputations. It's not clear that marijuana caused the decreased blood flow, but the vascular problems did worsen during periods of heavy use. Another 2001 paper, in Circulation, found a nearly fivefold increase in the risk for heart attack in the first hour after smoking marijuana--though statistically that means smoking pot is about as dangerous...
...more about Marijuana...