one time my sister, mother and I were sitting down eating a nice family dinner when I said something that pissed my sister off. to try and get back at me she goes "mom, did you know that darryl smokes pot?" My mom's reply was "Jenn, leave your brother alone."
that's the only time I have talked to my mom about pot. she grew up in holland till she was 14 and is now a free spirited artist, so she's chill.
as for my dad - he asked me one day if i smoke da weed, i told him yes, he told me "you shouldn't you know" my response to him was "why? 'cause it's illegal? you do know you're married to an alcoholic right?" that shut him up.
honestly though, how old are you? the way I've always looked at it, if you're smoking pot and you're under 13, you probably should stop, and if you are between 13 and 16 you should take whatever shit your parents throw at you. if you're 16+ sit down with your parents and explain to them the reality of smoking weed and try to make them understand that just because you enjoy a afternoon bowl doesn't mean you're going to grow up to be a meth head living in a dark house 'cause you smoked all your light bulbs.
But wait, you initially stated that you deal... maybe don't deal out of your parents house, you're putting them in a very tough position. If my kid (that is, if I had a kid) was dealing out of my house i'd smack him up the side of his head and be like, 'BITCH'.