The statistical fact that heavy cigarette smokers are more likely to die of lung cancer than are nonsmokers has been known for years, but no one has yet been able to pinpoint the process by which smoking exerts its lethal effect. That the death rate from cancer of the bladder is more than three times as high for smokers as for nonsmokers has been recognized more recently, and it has seemed even more difficult to explain. Yet, ironically, it is the hard to explain bladder cancers that have backed up statistics by yielding the first biochemical evidence that smoking...
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