Spending a tiny fraction of your life intoxicated allows you to make rational decisions despite occasional enjoying altered consciousness. There may be some level of brain damage but depending on the substance and how often it's used I question whether it's necessarily going to be the limiting factor in the aging body.

There is much new speculation by historians and archeologists that psychedelics are widely responsible for giant leaps in civilization and "society." Your take is a puritanical, modern view without regard to history or nuance.

Can you give a few examples of such well-functioning societies?

I think maybe there is no "clear headed and rational view" of reality in truth.

There is only perspective, which somehow relates to a thing we like to call "reality" but the relationship is tenuous at best and doesn't always directly correspond.

Understanding the role of perspective I believe can be valuable. Sometimes maybe a shakeup helps to understand perspective is just that, or otherwise produce a different way of looking at things.

Your comment is sensible and, apparently, roundly rejected.