Window & Fan
Once you’ve got the towel in place you can move onto ventilation. Location is everything. A room with no ventilation will do nothing to keep the smell of weed at bay.
If you’re trying to hide the smell, you’ll probably want it all out of the room as soon as possible. So the next precaution you’ll want to take is finding a room with a window.
A fan will clear the smell out of the room ASAP. Point the fan so that air is pushed out the window. That way, all the smoke in the room will eventually find its way out. It helps to exhale behind the fan so all the smoke can get shot right out of the window.
If you have a specific room you plan to consume your cannabis in regularly, consider purchasing an air purifier to eliminate the odors of weed smoke as its created.