Kids.

I don't think I'll ever have kids, but I might.
I don't really want kids, to be honest.
However, if I do, for some reason, end up having kids, this is my plan:
My kids will be educated about drugs, drinking, smoking, and sex.
I will not be one of those mothers who lets her kids drink at home because it's safer. That's just stupid.
I will, however, have an open door policy. My kids won't get in trouble for drinking, doing drugs, having sex, or smoking, as long as they don't lie about it or try to hide it from me.
I plan to share with them all my knowledge, so that they know their personal limits, especially when it comes to drinking. I don't want one of my children to be the kid who does not know his limit and gets alcohol poisoning his first time drinking.
As for smoking cigarettes, my plan is to tell my kids that if they ever want to start smoking, to tell me, and I will buy for them. I'll buy them packs of Bugler, and tell them if they can stomach smoking unfiltered cigarettes that they will have to roll themselves, they may continue to smoke. If they can't handle it, hopefully they'll realize that they don't really want to start smoking.
If my kids are going to smoke, they better be badass about it.
Basically, all I will require as a parent is honesty. I'll teach my kids to be good people, and to think for themselves.
I really hope I never have kids, though.