Health: Stolen Breath

It was unsettling enough that ABC anchorman Peter Jennings died of lung cancer just four months after announcing his diagnosis. Perhaps more distressing to the 90 million--plus smokers and former smokers out there was that Jennings swore off tobacco 20 years ago and was struck by the disease all the same. It's true that he had resumed smoking after the terrorist attacks in 2001, but he quit again. Can that first puff years ago start a fatal cascade of lung damage that can never be reversed? The answer is yes, and no.

Recently, British researchers wanted to see if there was...

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