I don't live at home with my parents, but the few times I've visited my throat burned from the smoke in the house. I rarely visit now, and I've pretty much told them that the baby won't be allowed at their house if they can't smoke outside or switch to the e-cigarettes so the house doesn't stink so bad. They at least bought an e-cigarette to try, so that's nice at least. But klg22 is right, even now your baby is breathing that through you. Tell your husband to take it outside for the sake of the baby.
Definitely make sure he smokes outside, even now- your baby will still be inhaling it through you. Maybe you could get some cheap fly screen or mesh and fix it to the windows so you can open them bug free... also if you haven't had a baby shower yet maybe youcould ask eeveryone to chip in for an air purifier. Or start putting away cash for one now. Good luck :-)