Boyfriend is smoking and I can’t stand it... help

So I’ve been with my boyfriend for two years and he’s always vaped at the lowest nicotine mg and recently picked up smoking. Vaping bothered me in the beginning bc I didn’t want him to get an addiction until he told me that 3 isn’t enough to get addicted until it’s constant every day, which it’s became constant since he told me that. But I’ve asked him to stop to prove to me he wasn’t addicted and he was able to, that was a while ago. I recently found out he smoked cigarettes on the low. We got into a huge fight bc he hid it from me and we made up. He hid it bc he thought I’d be okay as long as I don’t smell it or see it. But he told me he wouldn’t vape or smoke at the same time bc it’s a lot of nicotine and he was only smoking like 2 times a week, but still “slightly” vaping. He says he’s not addicted but if he isn’t, then he will be eventually bc he claims he goes to it whenever he’s stressed. His vape also messed up and literally the day after, he started smoking. I don’t want him to get addicted to them, he’s already got asthma and you’re not supposed to do it with asthma, I don’t want him to think that he has to have nicotine to relieve stress but he won’t listen when I tell him to try something else, and I don’t want the cons that come with it, like smelling like it, eyes and teeth turning yellow, etc. and Smoking brings back a lot of bad childhood memories for me, i can’t be around any type of smoke bc I have chronic bronchitis from being kicked in a car with it since I was a little girl and it will instantly make my lungs hurt and I get sick. I don’t ever see it, sometimes I slightly smell it but don’t say anything and I don’t want to tell him not to do it, bc I’m not his boss. Everyone I know that smokes has told me they regret it bc it’s a bitch to stop and I’ve witness them try to stop and what the withdrawals cause them and I don’t want that for him. But every time I see him or think about it, it makes me want to distance myself bc of how much I hate smoking and the one person I love and care about is doing it. What can I do to make this feeling stop?? Is there anything?