If he seems to want to avoid places he enjoyed smoking or other smokers, I would support that. I only quit because of pregnancy but went back to smoking as soon as I weaned my baby. Then I became pregnant again and quit right away.
I might have taken it up again but I joined a small group of moms who wouldn't have accepted a smoker. New friends, new activities and time have made me a true non-smoker, and I haven't smoked in more than 24 years.
My friend quit a couple of years ago, and for her, the problem was her porch, where she normally smoked. She couldn't go out there without wanting a cigarette, so she had to stop going out there for a good six months.
Best of luck to you and your husband.