chances are it will stain the walls if you're hotboxing, so i'd recommend that you either smoke near an open window, or use a product called spray-nine to clean your walls before you move out/when you notice that they're just not as white anymore...my mom always uses that shit in the bar here and it does a pretty good job. it says it'll kill the HIV virus in 30 seconds, so it should take off any smoke residue...and the smell, ya just spray something in there. and put a towel in front of the crack in the bottom of your door...it'll vent out into the halls and your fellow apartmates will smell it and rat you out.
Peace