My fiance is back home after being gone for 4 months...but he has gotten on my nerves!!! He leaves…

My fiance is back home after being gone for 4 months...but he has gotten on my nerves!!! He leaves shit everywhere and can't pick up after himself, and I have a 5.5 yr old and 4 yr old I clean up after. Plus, he smokes and it smells it gives me a fucken headache. We are going to have the baby in our room and I don't want shit smelling like smoke!!!