Its just a filthy habit. I always told myself I would never date a smoker, but I had flings with two smokers. Kissing them was like having a steam engine breathing down my neck, especially because it was an icy feeling due to the menthol cigs that the one would smoke.
I don't know why anyone would want to kiss a smoker. Being the condescending bastard I am, I always look at smokers as feeble minded and idiotic because they're knowingly killing themselves when cigarette at a time. Same could be said for the woman who frequents the drive-through at McDonalds.