Well, that way you wont have to worry about sending them to college. LOL Joking aside, shouldn't it be the parents responsibility to teach their children that smoking dope is bad? Weather or not it is illegal doesn't change the fact that it should be the parents responsibility to instill values and the character necessary to make the right decisions in life.
It is my responsibility to PROTECT them from filth. If the police and the courts won't do it, I'm perfectly happy do it myself, in fact, I would prefer it... a .22LR round only costs a nickel, which is much less than what it costs me in taxes for the legal system.