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There's a lot of truth here, but I think you're neglecting to give yourself the credit due for correctly assimilating it.

To me one of the more present dangers of the "acid experience" is that the tripper latches onto the alternate state they experience and devolves into crapping on about chakras, energy fields, or little elves that live in their garden; the real lesson, as you've rightly identified, is not that the new experience is objectively real - it's that our "normal" daily experience is entirely subjective.

It's not necessarily the most natural conclusion, however, and I suspect that maintaining this kind of scientific (read: sane) outlook becomes increasingly difficult with frequency and intensity of use.