im lucky i dont have to worry about this anymore. i used to be really afraid of my grandparents finding out that i smoked but then after the second time i was caught i just figured fuck it. i smoke in my room now and my grandparents know to knock.. when they dont knock.. if they smell anything or see anything they usually dont mention it. now they say they dont mind me smoking pot as long as i dont drink. i do both either way *shrug*

ps: i know that joints are almost always the smelliest.