>Teenagers and younger don't have the purchasing power of the adult US population which is financing the international drug business.
>It would still be a problem amongst kids as is alcohol abuse. But the scale of the problem would be completely different the funding of the drug cartels would dry up and you resources could be focussed more on where they are needed.
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Teenagers are a major force in the economy, maybe not with their money, but they do have access to funds. Then there's the criminal teen population, who would be out in force stealing stuff to fund their excellent adventures.