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In old age (table 4) the difference between cigarette smokers and non-smokers in the probability of a 70 year old surviving to 90 increased from only 2% (10% 12%) at the death rates seen during the first decade of the study (among men born, on average, around 1875) to 26% (7% 33%) at the death rates seen during the fifth decade of the study (among men born, on average, around 1915), indicating that the corresponding difference will be still greater for those born in the 1920s

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Through the interwar years, studies by Franz Hermann Muller and others laid the groundwork for the case against smoking, though American doctors would take until the 1950s to duplicate, confirm, and publicize the findings

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