Towel Under The Door
If you’re trying to hide the smell of a session, the first step you want to take is putting a towel down in front of the bottom of the door of the room you’re in. Even grinding your weed, dabbing and vaping are detectable on the other side of an untoweled door.
If you don’t want anyone outside of the room to know what you’re up to a towel is necessary.
Just dampen a towel and use it to fill any gaps between the floor and door. This will work with most doors but some have large enough cracks in the sides of the door to allow smoke to seep through anyway.
If toweling the door isn’t an option you’ll probably have to smoke outdoors. Take caution when smoking cannabis outdoors because even most states with legalized marijuana won’t let you smoke it in public.