carcinogens

Okay, I admit it.  I've never considered myself to be a smoker, but occasionally, I used to smoke to relieve stress or just to feel the sensation in my lungs.  I reasoned that the occasional puff wasn't enough to do much harm and that my lungs would clean themselves after I finished my binge.

Everything changed for me when I looked at a certain cigarette pack.  (This is what happens when you live outside the U.S.)