I'd like to bring my comments back to the OP.  While there are many similarities betwixt NDE/OBE and psychedelic/OBE.  Primarily, everyone dies eventually and the vast majority of humans have never tripped on any type of Sacred Medicine.

And in this light, near death experiences alone, almost never facilitate entering into sky-high Samadhi states.  Whereas, there are many souls who enter into higher frequency states of conscious-awareness, under the enigmatic force of entheogens.  This goes back to the Vedic Soma and shamanic encounters during earlier historical periods. 

In synopsis, I feel that the experiential modality ignited by psychedelics, are but part of the equation.  After my peak experiences, I continue to follow the meditative entrancement, despite the molecule's ending point.  Often, I spend hours in deep meditation, post the elevator ride of entheogenic expansion.  Thoughts?