Getting back to the original post, I want to point out that altered states of consciousness have always been associated with religion . . . whether caused by drugs or other circumstances.
I have the idea that temporal lobe epilepsy, for example, has played a very important role in religion, as Geschind Syndrome (sometimes associated with temporal lobe epilepsy) creates intensely religious feelings, along with a mystical euphoria that makes one feel connected with the Cosmos . . . as well as a compulsion to write.
These altered states of consciousness were actively sought out by religious mendicants all over the world throughout history. Jesus (for example) supposedly retreated into the desert wilderness for 40 days to fast and be tempted by Satan.
Fasting certainly can become hallucinogenic.
As another example from Christianity, consider the ancient practice of self-flagellation, which probably plays biochemical games with the endorphins, dopamine, and seritonin in the brain . . . which is something that–I believe–they have in common with adolescent “cutters” whom deal with stress by slicing themselves with razor blades.
I (and many other people) even do something very similar . . . when we enjoy super spicey foods with lots and lots of cayenne pepper.
While discussing the relationship between religion and altered mental states . . . consider the spinning dervishes of Turkey. They spin in circles with the idea that the practice brings them into a state of religious ecstacy that allows them to commune with Allah. I don’t think that it’s a coincidence that people with inner ear issues may be more prone to out-of-body experiences (as was mentioned in another thread on this forum), and that I think that there may be a connection between the practices of the spinning dervish and the idea that inner ear issues may cause mystical experiences.
I also think that sleep paralysis is relevant to this discussion as well. I, myself, have experienced sleep paralysis on four occasions that I remember.
Unlike most people, I found the experience to be interesting and enjoyable . . . rather like taking drugs.
The first time it happened, I was about 17 years old, and it lasted for over 45 minutes.