One thing that suprised me after quiting smoking was to find out how many of the people who hasseled me about my smoking were closet smokers themselves. I never knew it when I smoked 1 1/2 packs a day. After I quit, I can tell if a person smokes when the walk in the room. Anyways, add another person to the list of people who quit by cycling. Actually I think I never quit, just swapped smokes for a bike.