i smoke in my room all the time and have never been caught i do alot of the things listed here like the dryer sheets, pillow and blowin out the window.... but one of my favorites was buying a couple feet of bendy plastic tubing, like 5/8 inch, and puting one end out the window and closing the window on it, so there is no blowback and just blowing out the tube, seemed to work best as long as you dont have nosey neighbors or your parents window isnt too close to yours, but incense gum and axe are you buddies if your smoking in your room