Each group of four items contains a topic, a main idea, and two details that support the main idea. Click on the main
idea in each group.
Group 3.
a. Those exposed to secondhand smoke for 30 years or more are 23 percent more likely to get lung cancer.
b. Exposure to secondhand smoke presents a number of serious health hazards to nonsmokers.
c. Exposure to secondhand smoke.
d. Nonsmokers exposed to secondhand smoke at home have a 15 percent higher death rate than those exposed to
clean air.