boyfriend pressure😒 advice ladies

So I used to smoke weed before I got pregnant I stopped but my boyfriend didn't. I don't care that he smokes, I care that he is always trying to watch shows and smoke while I'm in the room. I'm 8 months now so I'm not sure if I'm tweaking and it isn't effecting the baby and I or if I should just stand my ground. What do you think? We have been fighting more about how I walk out while he smokes and he takes it as I don't want to spend time with him. He says Snoop dog and Wiz kalifa smoke and  their kids are fine. 🙄 I just wish he would understand he says I'm being bitchy about it and all I do is hide in the bedroom. We used to do everts together, and hangout a lot. Now I'm just trying to get ready for the baby. He says he will go elsewhere to smoke when she gets here. We don't need anymore strains on this relationship, I just want to be happy and healthy. Am I over doing it?