Relationship between cigarette smoking and incidence of lung cancer

Questions 1 (a-): Two cohort studies were conducted. The first involved an assessment of the relationship between cigarette smoking and incidence of lung cancer. For cigarette smokers, the lung cancer incidence rate was Ie = 200 per 100,000.  For nonsmokers, the lung cancer incidence rate was Io = 25 per 100,000.  The lung cancer incidence rate in the entire population was It = 100 per 100,000. The second study involved an assessment of the relationship between cigarette smoking and incidence of coronary heart disease. For cigarette smokers, the coronary heart disease incidence rate was Ie = 500 per 100,000.  For nonsmokers, it was Io = 250 per 100,000. In the overall population, the coronary heart disease rate was It = 300.  

A. Is cigarette smoking a stronger risk factor for lung cancer or coronary heart disease? Explain.

B. Hypothetically speaking, if cigarette smoking could be eliminated from this population, what percentage of lung cancer and of coronary heart disease could be avoided?

C.Did cigarette smoking result in a larger public health burden for lung cancer or coronary heart disease? Explain.

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