doob tube
incense/axe/scented candle
ceiling/bathroom fan

those are all you really need to keep the smell away.

and in case you don't know how to make a doob tube:

you take an empty toilet paper/paper towel roll and stuff anywhere from 8-15 dryer sheets (fabric softener/anti-static sheets for your laundry) and tape one around the end. just blow your hits through this, and your room is hotboxed in potsmoke that smells like laundry. be sure to make a new one after like 10-15 sessions, though. they get old.