When it comes to shit like this, only thing you can do is prepare and prevent. I smoked ganj in my dorm 3 doors away from my RA throughout college and was never once busted. As long as you contain the scent (Plug your door good), Dont smoke j's or blunts, And deoderize (Place Fabric Softener sheets over any exit vents and sploof your hits), you should be good. Oh two more things. Obviously, you don't want to hotbox the apartment if it has exit vents, So crack a window and place a fan in it. Also invest in a high grade odor spray. Personally, I use 420 smog out since it doesn't make the room smell like I just nuked it with febreeze.