Earlier quoted context omitted.
It's more acceptable and state-sanctioned to sell drugs that kill people while keeping them subdued, than ones that keep them alive and open their minds. I don't want to sound like a crazy 'conspiracy theorist' or a 'hippie', but I don't know to distill this sad and truthful statement more simply than that.
The reasons why tobacco and alcohol are legal are mostly historical and they are basically the only exceptions. There are many drugs that kill people but keep them subdued that are illegal. It seems to me that is not the reason for which are legal and which ones are not.
Considering the counter culture and anti war (and thus anti military industrial) sentiment being highly correlated with hippies getting lit—I think it’s impossible not to come to the conclusion that the powers that be consider mind expanding drugs to be a threat to the order of things.