My parents don't smoke, and I'm guessing they know I smoke, as my room usually smells like weed, I always have incense or candle's lit in my room, and my eyes are always bloodshot from always smoking. However, I do smoke with my older brother (he's 7 years older then me) on pretty much a daily basis.... If my bro didn't smoke... it'd really suck having to keep all that shit to myself... but we're both major stoners.