Medicine: Smokers' Habit

Is smoking bad for the heart? Non-smoking wives tell their husbands that it is. Heart specialists, many of them smokers, are not so sure. Last week the Journal of the A.M.A. set out to weigh the evidence.

A few things are agreed: e.g., cigarette smoking usually shrinks the small blood vessels in the hands & feet, sends the blood pressure up, and boosts the pulse rate by five to 20 beats a minute. It is clear that the shrinking of the arteries is caused by nicotine, because denicotinized cigarettes do not produce this result.

While doctors are still not sure that smoking ever...

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