You don’t have to accept anything, OP. If it’s a choice between him smoking, or leaving him because he chooses not to stop, then it might come down to that.
I do smoke, 4-6 a day, but never in the house, I don’t like it. I live alone, so it’s my choice to do as I please. I wear an old jacket when I’m outside smoking, which gets washed once a week, and put all the butts in a jam jar of water, as I’m paranoid about fire risks. I tried vaping, but it made me cough all the time. Ironic, but cigarettes don’t seem to do that to me. Alcohol makes me heave, even the smell, as do fried foods, but I wouldn’t force someone to give those up for me. It would only create resentment, and likely to make them engage in the behaviour more, from stress.
If you don’t want to a stand-off, might it be an idea to suggest if he wants to smoke, he does it outside? I can sympathise with you with regard to the smell being on everything, if you don’t like it, it’s horrible. But I do think that if he smoked when you got together, you’re being a tad unrealistic to insist he stop now.