The lifespan of a smoker tends to be ten years shorter than that of a never-smoker. But smokers who quit by their 40th birthday can expect to live nearly as long as those who never took up the habit, according to a new analysis of health survey and death record data from the US. Prabhat Jha, a a professor in the Dalla Lana School of Public Health at Canada's University of Toronto, and colleagues, write about their findings in the 24 January online issue of the New England Journal of Medicine, NEJM...
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