“If you quit by age 35, by the time you’re 45 you look pretty much like a never-smoker in most of our profiles of risk,” said Terry Pechacek, associate director for science at the federal Centers for Disease Control and Prevention’s office on smoking and health....

Located @ http://www.lungblog.com/2008/07/08/the-so
oner-you-quit-the-better-it-is/.