My father used to swear like a trooper, and I still avoid swearing.
The effect of this is that when I do swear, people take notice.
He smoked 80 Capstan Full Strength a day, too, and I never started smoking, either.
So perhaps we should swear and smoke in front of our children so as to immunise them.
(my daughter, now 26, doesn't smoke or swear. Furthermore, having seen her own oarents' example, she doesn't drink either!)