SO's drug use while I'm pregnant.

The father of my baby (I'm 27 weeks along) is a drug addict. I knew him before it got this bad. His drug of choice is meth. He uses it in his garage when I'm at the house. I know he can't just stop. It's an addiction and we have no resources for him to get help. 1) could this be harming me or my baby if he smokes it and smoke is in the air? I have never ever used the drug and I'm too scared to leave him in fear he might get worse!