Dr. Andrew Weil wrote some of the most exciting books about drugs and mind liberation I ever read.
The Natural Mind was a coherent manifesto without dropout drapery that argued many cultures used psychedelic drugs to shape young minds and the upsides were notable. Included original research into native-culture ceremonies and many insights. I have not read this completely revised version. But to be blunt I would say his original expression, warts and all, beats it.
The thing that weirded me out about his followup — The Marriage of the Sun and Moon — is that he had obviously figured cashing in on New Age vibes would pay off more than a lonely crusade to make acid experimentation a more normal and controlled part of American psychology research. Like they say, the beginning of the end.
Now he turns up every few years like a wind-up interview toy and gives the same spiel, with modifications, over and over. It’s not incorrect, though misleading I think in parts, just such a sad step-down from the potent message on mind liberation he once articulated.