Smokers be warned. A population based study in Japan published in the BMJ followed up nearly 70,000 residents for an average of 23 years. Of the men born between 1920 and 1945 who started smoking by age 20, 72% survived to age 70. Men of the same age who never smoked lived 8 years longer. Of the women in this age group who started smoking by age 20, 79% survived to age 70. Women who never smoked lived, on average, 10 years longer.
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