We can not stop fighting against drug use for the sake of the next generation.
Finally the one argument: for the children.
Rememeber children have responsible adults who should care for them. But do you think that criminal repression, meaning the power of the state against addiction will protect the children? The USA has tried... And in a big way and was unable to breach a simple equation: the riskier the psychoactive trade is the more profit it generates. The illegaler this trade is the closer to others illegal trade it will be handled. For human merchants for example, inert substances are so easy to handle in comparison...
But to comeback to your point don't you think education is better than repression. Let's say a child fall in the path of addiction, do you sincerely believe that putting him or her in a jail will make him later on a productive member of the society? Remember there was no victim !!!! No one was hurt but the child. So why should the child be punished?
The other aspect is Liberty. So what are you gonna ban for the children? Video games? Sugar? Too big sodas? What is the limit and who decides? This a combat between the cultural Marxists (or at least the statists) and the free humanity. Why shall you impose your standard on the children of others? Next is no pork for everyone? This is the slippery slope.
I hope you will one day be able to understand... But frankly I don't except much Gahs... But personally I think it's easier to fight you.And by this using the power of the state against you for infringing on the liberty of another individual. Without regrets and 0 remorse, your death is the liberty of millions. Sorry it's life.