just put a towel under your door. Try to use a pipe or something. the last thing you want to use if your afraid of smell is joints/blunts. and finally get Ozium. Its an odor killer, completley removes any smell of weed in minuets just dont overdo it. You can find it at places like walmart or auto stores. The smell of weed goes away alot faster than you think. Just leave the window opened and set the fan on and give it like 20-30mins to clear out. If your using ozium just spray it a few times it let the room clear out with the fan on and window open for like 10 mins.