To bring in another side: I know a nice, good ben-Torah who has been trying to stop smoking for many years now. When he started dating, he stopped; when he got married, he stopped; when he had his first child, he stopped… As you can see, he knows the dangers yet can’t help himself. How/why he started in the first place I don’t know, but he is now a big talmid chacham and ben-Torah, although he still sometimes smokes. His wife was very against the smoking thing when they got married and still is, yet they got married.
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