Which Statement Concerning the Effects of Smoking Is NOT True

Which statement concerning the effects of smoking is NOT true?

A) Smokers tend to miss about one-third more work time than nonsmokers because of respiratory illness.
B) Cigarette smoking may increase the likelihood of panic attacks,anxiety,and social phobias.
C) Men who smoke ten or more cigarettes a day may experience erectile dysfunction.
D) Cigarette smoking has shown to decrease the development of gum disease.