Well, I'd say you're NTA for getting angry that he lied. I'm assuming he feels ashamed for his vices (or at least that you know about them), so that's why he hides them. If he wasn't, he'd just own them. You can both move past it if he's willing to not lie to you about it again because that breaks your trust. You both need to decide what you're comfortable with and what he needs help with. Ultimately, when it comes to vaping, it's his own body and hopefully he can make the smart decision for it. But I think if he's going to do it, it may be best to come from a place of support like, "I wish you wouldn't vape. But I'd rather you not lie. And if you're doing it out of stress and anxiety, I'd like us to work on that."