If I smoke about 1/2 hour before my parents come home they won't smell it when they get home. To be on the safe side, I really suggest people invest on a vappy. They are incredible. They don't smell for more than like 5 mins, the smell dosnt spread 'round the house, or even out of the room, and if you just spray some axe, it's gone. I've had people walk in in the middle of a vappy and they don't smell it. Also, they save you a dick load of weed. Just a little will fuck you up.