Select the correct answer. Which of the following is an effect of smoking? A. A smoker's heartbeat is three times slower than a non-smoker's. B. Smoking slows down your lung growth. C. Smoking improves your lung function. D. Teens who do not smoke suffer from shortness of breath more often than those who do smoke.
B. Because cigarettes leave sort of a tar that burns the inside of your lungs and stunts their growth because your body is trying to make sure your air stays in the lungs.