Which of the following is an effect of smoking? a. a smoker's heartbeat is three times slower than a non-smokercs. 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.

Well, I know it slows your lung growth cause of the Little Lungs commercials and my parents smoke s I'd say b

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