boyfriend smoking

My boyfriend smokes cigars when he drinks and lately he's been hanging out in the house so he's been smoking in the house. I'm getting so fed up I've told him 100 times not to smoke in the house. Mainly because I'm pregnant but also because it stinks and we have a small house. I just told him this a few days ago and he gets drunk and forgets and doesn't care. And even tonight he did it again and I'm in bed and texts him please don't smoke in the house. Well I went down stairs and he lit up another one and I yelled at him and he just ignored me. So I just opened all the windows when it's freezing out to let it air out. I'm beyond frustrated and mad he doesn't listen or doesn't get the point of it.