mil smokes in her house

Windows closed. 
Doors closed.
She goes through multiple packs a day.
On the rare occasion we take our babe to their house (seriously she's four months and has been there.... maybe 3 times and they only live a town over), she starts coughing in the car big time (we only go there if we're in the area which isn't often because his family doesn't like me 🤷🏼‍♀️).
We'll be there not even a full 20 minutes (I get obnoxious when it's been like 15 minutes. "Okay we have to go now," and start putting babe in her car seat) and have to go home and shower/wash our clothes because of the smell.
Am I wrong for telling my husband they (his parents) have to come to our house if they want to see her?
He gets so mad but I always say, "Her health comes first- and that is NOT safe!"
I want to protect her. Some things are out of my hands, but this is not one of those things????