What to do

So I have an issue. I live with my mom and my 5 month old and my fiancé. My mother is a smoker and I am starting to hate it soooo much more. She does smoke outside but still. My fiancé has to go back to work and I will be working 2 days a week. So she will be watching him. Idk What to do 😔😭 quit my job all the way and stay in my room with my son all day everyday or what.