People only quit smoking when they want to. If you try the nagging approach, you'll become an ex whether you want to or not. He knows you don't like it. Encourage him if he decides to quit; otherwise either accept his smoking or end it. Showers and mouthwash can minimize the incovinience for you, but you may have to decide if you can accept him as a smoker. Cigarettes are harder to quit than heroine.

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Confucious say, "Woman who put man in doghouse soon find him in cathouse."