Talk to your roommate AND talk to the RA also. Maybe talk to the RA on how to handle the situation type of thing. My son has had random roommates but have different schedules and like never sees him. So that is not so unusual.
At this point there will be others looking to change rooms also for various reasons. The RA can help with that or housing. College dorm rooms tend to be stuffy and hot this time of the year
Adding smoke smell to that and typical hygiene and smell from dirty clothes… Yea, I would see what my living options are. Maybe you can get a single at this point. My daughter had a last term senior as her roommate when she was a freshman. After the first semester the girl graduated. My daughter at first was like sad since she had no roommate. Then 10 minutes later she was “elated” since she didn’t have a roommate and totally redecorated the room and made the extra bed like a couch with pillows etc. She loved it! (sorry for the flash back… Lol)