That one is actually enforced by police, by general society that calls police when they see junkies. Limits on smoking and alcohol are enforced by sellers who c

That one is actually enforced by police, by general society that calls police when they see junkies. Limits on smoking and alcohol are enforced by sellers who cant sell to kids and regulators who punish sellers who do. Parents are not expected to follow the kid home from school and watch it every second. Parents are expected to have general talk about drugs. Oh yeah, and it is illegal to maket smoking to kids. Meanwhile, facebook spends billions on A/B testing increasingly sophisticated addiction builders ... and you expect the kids and parents to just be able to win over it with no support.