I hate smoking and my boyfriend says I should still let him even if it makes me upset. Is he right?

I really hate smoking a lot i dont trust him bcs he himself has said that he hates it and will stop but he has always ended up smoking a puff or two and still he expects me to let it go even if it makes me upset. His entire friend circle smoke and drink excessively and im afraid he's gonna start doing that too. He says he won't but i dont trust him. what should i do

I hate smoking and my boyfriend says I should still let him even if it makes me upset. Is he right?
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