First off if you're smoking a bowl you should be fine. Its the people who are smoking joints and blunts and/or baking out rooms that have a hard time getting rid of the odor. You can just smoke that bowl in any room with a window, exhale in the direction of the window. It will smell, but not for long. Fans help, since you can prevent the wind from blowing the smoke right back into the room.

Also, its important to remember that we automatically get "used to" any smell. Meaning lets say you took a hit in a room. YOU probably wouldn't even smell it, but if someone else walked in that room THEY, however will be able to smell it.