Don't listen. Doob tube sucks. I tried it and I left room and came back and it still smelled like weed. I might not have done it right but I took the cardboard roll from the tissue and taped one side off and stuffed it with dryer sheets. Some one told me to tape one side off. I never tried it with the other side of the tube not being taped. But other than smoking with a wet towel under the door and leaving your rooms windows wide open (with possibly a fan blowing air out of the window) there is no way to smoke inside without hiding it. Spraying it and burning things just mixes in with the smell so it smells like what ever you tried to hide it with, plus weed.