Epidemiology for Public Health Practice 5th Edition by Robert Friis,Thomas Sellers

Exercise 9

On the basis of the RR and etiologic fractions associated with smoking from lung cancer and coronary thrombosis, which one of the following statements is most likely to be correct?
a. Smoking seems much more likely to be causally related to coronary thrombosis than to lung cancer.
b. Smoking seems much more likely to be causally related to lung cancer than to coronary thrombosis.
c. Smoking seems to be equally causally related to both lung cancer and coronary thrombosis.
d. Smoking does not seem to be causally related to either lung cancer or coronary thrombosis.
e. No comparative statement is possible between smoking and lung cancer or coronary thrombosis.