Ex smoker here, quit 11 years ago.
My reason was I needed an operation and the surgeon told me I had to quit. He didn’t go as far as saying he wouldn’t operate if I didn’t quit, rather that the reconstructive surgery afterwards would take much longer to heal and complications could arise.
Regardless of whether that was an absolute truth I made a begrudging appointment to see the smoking nurse to help me quit. I had patches and one of the nicotine inhalators (no vapes back then) and I did actually quit for good.
A smoker has to want to quit, you have to want to do it. When I went to see the smoking nurse I thought I’d be doing this as a temporary measure, until I healed but once I stopped I realised just how much easier it was, maybe I’d got my head around it a bit more by then who knows?
Regardless of what you think you will smell of smoke! I used to pop a piece of gum in once I’d finished my cigarette, thought that would mask the smell! Only once you quit do you realise just how strong the smell is, even from one cigarette!
Another thing I was amazed at was going food shopping! I could actually smell the fruit and veg, I could smell things I couldn’t before. I did smoke 20+ a day though.
As an ex smoker now I would encourage anyone to try and quit. There are so many products out there to help but that’s all I’d do, I wouldn’t demand. Your DH knew you smoked when he married you, you’re not a heavy smoker but he still will smell it on you when you walk back in the house but regardless, he shouldn’t now be demanding you quit, this has to come from you and be your decision.