Doll and Peto demonstrated that the mortality ratios for lung cancer were similar among those who smoked 1-14 cigarettes per day and those who smoked 15-24 cigarettes per day.

Question

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Doll and Peto's studies showed that the mortality ratios for lung cancer increased with the number of cigarettes smoked per day, indicating higher risks for those who smoked more.

Doll and Peto Demonstrated That the Mortality Ratios for Lung