I never had a bad work habit, EVER. In fact I got more done that most people because I didn't chat (like on a website) all day!
Everyone has their own problems...no, smoking isn't the best thing you can do for your body, but there are a lot of things people do that aren't good....smokers just got knocked for it a lot more.
Just my 2 cents!
This is the exact reason that people hate talking to non-smokers about it, and it sure doesn't help make people want to quit!