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To the Editor: The presence of Po210 and Pb210 in cigarette smoke may help to explain a paradox found in smokers of low-tar, low-nicotine cigarettes. Hammond et al. (1) noted that the number of deaths from lung cancer was greater in subjects who smoked 20 to 39 low-tar, low-nicotine cigarettes a day than in those who smoked one to 19 high-tar ... ................
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