It's also the responsibility of the parents to teach their children about the evils in life, including drug abuse.
I hope you have the same feelings against alcohol though. I've had tons of experience with heavy drug users, potheads, and alcoholics, and I can tell you that alcoholics are the most damaging of the bunch. Potheads are, by far, the least bothersome of those three. They want to get high, watch TV, and eat potato chips. I'd rather deal with a pothead than an alcoholic any day of the week.
We don't have control over our kids. The schools, peers, popular culture, and social media apps do.
Also we don't have control over our kids when we divorce and the kids live with the former spouse.
Do you have teenagers now? Experience is the best teacher.
I'd be cool with making alcohol entirely illegal for minors except if provided by the parent of the kids for consumption under their parents' supervision. I'd be happy to make smoking entirely illegal for everyone.
Kids caught drinking outside of supervision would be subject to 3 days of intense exercise equivalent to boot camp military training. Ditto smoking. So as to replace their habit with experience and knowledge of intense exercise (which for the most part is the antithesis of consuming toxins).
It is impossible to make alcohol entirely illegal. Even Durterte in the Philippines didn't dare attempt that. He did put a liquor ban after 2am. And he put a curfew on minors I think 10pm. He has a smoking ban in public venues which include open air public transportation.
It would a lot easier raising the kids in a like minded community that watches each other's kids. So then we don't need all these strict laws.
Or I have another idea for society-at-large which is kids can do what ever the fuck they want, but the parents are not responsible for anything including not responsible for providing any financial support nor care to their kids.
I'd rather just be responsible for myself and no one else. But the State forces us to be parents. In that case, I'd rather raise kids in a small, close-knit community.