Or psychoactive drugs don’t teach you anything new but rather modify brain functionality such that you feel different. Gaining new belief or believing you have new beliefs are typically indistinguishable from the inside.
If you want to be content and enjoy life, why not get a lobotomy. It's a more consistent result. Oh you don't want to do that to your brain? Well acid may have different mechanisms but can trigger similarly drastic effects, it's just now you've introduced a roll of the die, and I'm not a fan of gambling without a winning strategy.