PBS Newshour: Smoking cessation expert quoted on unchanging numbers of smokers

Gary Giovino, professor of health behavior, is quoted in an article on PBS Newshour's The Rundown blog that reports one in five Americans is a smoker, according to a study released by the Centers for Disease Control, a percentage that has remained unchanged since 2005. He said many researchers believe a "hardening" of the smoker population might be contributing to the stalled decline.