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The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among smokers. The death rate per 100,000 for coronary thrombosis is 422 among non-smokers and 599 among smokers. The prevalence of smoking in the population is 55%. The population etiologic fraction of disease due to smoking is:
Population Etiologic Fraction = [I SUBp - I SUBne]/I SUBp
Give percentages or state that cannot be answered.