IMHO, in the ideal world, all psychoactive substances would be "legal" BUT ONLY legal if dispensed by a sort of a shaman. Or something long those lines…
You want to get high?
Then, you must prove to the "shaman" that you are ready. You get initiated, you are accepted into his exclusive group. You go through grueling tests. You advance deeper into the sacred knowledge… You are slowly guided into the proper mindset, the proper state-of-soul…
THEN… take the toke.
Something like that.
Now, we've got a "therapeutic" that is sold like candy, literally, and any Tom/Dick/doofus can self-medicate to according to his own assinine excesses.
Some people, indeed, have the self-discipline. But honestly, MOST do not. And are literally NOT appreciative of the true possibilities.
It's not only waste, but it can be dangerous when used recklessly.
It's not a game. But that is unfortunately, how it is all too often being approached.