well zhoro's answer i like

Tattvamasi, yes, it was after experience of tryptamines that i became interested in advaita vedanta, a while after..i spent time studying a few different ancient traditions in spiritual viewpoint, cosmology, mental approaches, disciplines..as far as advaita vedanta is concerned, i resisted it for a while from early exposure to 'neo-advaita', though i appreciated some vedic texts (and the devi) ..it was after a friend got me reading adi shankaracharya and i re-read the major upanishads that i appreciated what a refined language/philosophy framework it was, of the written traditions, for describing some levels of experience..

the natural progression with entheogens was to focus increasingly on consciousness itself..for the perceiver to face itself..the language of advaita reminded me of what i was contemplating..observing..

there can be transient experiences where the object and subject and perception blend and which are timeless..they can be difficult to recall without focus, let alone describe.. glimpses of states which are known in a range of older spiritual disciplines..which i also appreciate..

entheogens, beyond their dynamics, led to becoming aware of a continuum between any entheogenic state and apparently 'ordinary' states..not to be astonished anymore ..becoming more aware of what is there in all states..

the 'entheogenic' aspect increasingly remains even without 'visions'..what is 'it' ? it's beyond the entheogens..they are a potential training ground in mental dynamic and focus and observation.. advaita is beyond the dynamic..

so, was a progression, Tattvamasi..

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'Contemplation On The Subtle Sound' (Adi Shankaracharya)

ॐ