Which of the following is true of smoking?
A) Lung cancer rates have been shown to rise and fall with smoking rates.
B) Before smoking became popular in the 1920s, lung cancer was common.
C) Scientists knew in 1940 that smoking causes lung cancer.

Question

Quizplus · Accepted Answer

Lung cancer rates have indeed been shown to rise and fall with smoking rates, reflecting the direct impact smoking has on lung cancer incidence. Before smoking became popular, lung cancer was actually quite rare, and the link between smoking and lung cancer was not widely recognized until the mid-20th century.

Which of the Following Is True of Smoking