Read the claim. CLAIM: Smoking causes lung cancer.
Which statement of evidence best supports this claim?
Select one:

Even people who smoke fewer than five cigarettes a day can develop health problems.

Smokers are 23 times more likely to develop lung cancer than non-smokers.

10 to 15 percent of all lung cancer victims are non-smokers.

Smoking doubles the risk of heart failure among both men and women.