I'm aware we never "ban" any specific substance, as we say the dose makes the poison. And any substance that has any effect is also a potential cure for the disease that has the opposite effect.

I should have been clear I saw it in the "make people smart" light, as doping an already acceptable situation, instead of correcting something perceived as a pathology.

Meth was widely available over the counter at some point, and we made it legally disappear outside of strict medical settings.