I wouldnt smoke in your room until you've talked with other people who have lived in the dorms at the school you're going to go to. Some schools are stricter than others, and its good to figure it out through someone elses experiences rather than your own.

I'd invest in a safe, regardless of if you get a room mate or not. No one can look in something thats locked.

I dont know about the room mate situation. Mine kind of sucked. Some people form life long friendships because of them. Its a gamble.

Good luck with it. Next year will be my first year living off campus.