Marathon runners: A tend to have more slow twitch muscle fibers
B can run only run one or two marathons a year
C are always very thin
D only way carbohydrates

Which of the following statements about the societal costs of tobacco use is true? a. tobacco use affects the tax rate of only those individuals who smoke. b. the negative effects of tobacco use are only experienced by the smoker. c. tobacco users contribute to an overall loss of productivity. d. increased healthcare costs are mainly absorbed by tobacco users