Smoker in the house

I have a brother in law that smokes in his room when he is at home in the morning and at night and that smell lingers outside to the hall where my small infant sometimes spends time outside, and used to sleep there at night when my mother in law takes care of him. She already told him not continue in the house but he is still doing it. I have since then make sure the baby spends more time in my room which is further away from him and also at night I don’t bring him out. I’m concern about the smell and how harmful it is for my baby, how long does it actually take to go off