Or, you could just teach parents to be.... good parents.
The apparent assumption here among many people that these substances are intrinsically bad is baffling to me. Where do you draw the line? Surely it can't be "legality", because several of the "schedule 1" drugs are completely harmless, and possibly even naturally occurring (in your own body!). If potential for bodily harm is the deciding factor, then we should be discussing alchohol "cures" looong before anything else. It is absurdly common and absurdly addictive.
Yes.
Good parenting decreases the chances a child will break the law in general, or be in a self destructive place.
Parenting has a lot of influence on children contrary to some peoples beliefs...
Good parents should also teach their children the difference between legality and morality.
http://en.wikipedia.org/wiki/Lawrence_Kohlbergs_stages_of_mo...
Smoking tobacco is legal (for now), but is increasingly being made illegal (public places, restaurants, etc). Which is a good trend IMHO.
As for antisocial? Well I can't speak for your experiences but for myself and the people I know it has been nothing but the opposite. Everyone needs to decide for themselves, including your kids.
Aside: Interesting fact about those restaurant/bar smoking ban laws: the reason they need to pass laws specifically for that purpose is because air filled with second hand smoke does not exceed the relatively very loose air quality regulations OSHA has in place. If that smoke were put there by anything besides smokers, nobody would say a thing.
Where do you draw the line. I am ok with banning something for health reasons. Not so much merely because a subset of people find it "antisocial".