I have heard some quite remarkable reasons for wanting to give up smoking but the client I had last week must be unique.
He wants to stop smoking because he wants his wife back. She left him because of his unsocial behavior. He loves her and wants her to come back into his life.
He doesn't think that he could find another woman who would accept his cross dressing the way she did. So he wants to show her how much he loves her by stopping smoking. He hopes this will prove that he would do anything to win her back.
It doesn't get more romantic than that.