I'm actually okay with this one even given my propensity to dabble, unless they're over 16 and it's pot we're talking about. Then I'll tell them because I would prefer them to go about it in a smart way if you know what I mean. - don't get it in the ghetto, don't do it before school, don't give up your money so somebody can go get it, etc. As for real drugs, I'll be a huge hypocrite, because you don't want them thinking these are okay things to dabble in. But when they're at a mature age, I'd tell them about those experiences as well. But I will say this, this is the 21st century, kids aren't stupid, and they know what went down in your past.