To those who don't like cigarettes

What would you do if your partner knew you didn't like cigarettes & didn't want them to smoke it either. Or didn't smoke cigarettes when you got together but his coworkers got him into smoking so now he smokes. He doesn't smoke around our son & I, just when he leaves the house somewhere or at work but when he comes home I can smell it on him. I tell him to take a shower or wash his hands & brush his teeth because I can't stand the smell of it. (No offense to those who do smoke, I just grew up in a home where everyone was against smoking. My father used to years ago until he went to prison & coughed up a huge glob of who knows what so he quit smoking.) It's up to him whether he smokes or not but personally I'm not sure how I feel about it.. btw he's only 19 & no one in his family smokes either.