Most of my friends smoke- besides having to wash the smoke smell out of my clothes and hair- I am not bothered by it much. Sometimes it irritates my throat, but not often.
My boyfriend smokes- and trust me, kissing him is not a problem.
The whole ashtray thing is highly overhyped.
Only reason I would want them to quit is for their health- but so far I have not found a way to force someone to quit before they want to.