As well as many other people who don't happen to post to bluelight, I've experienced many different worlds.... many different dimensions, many different types of beings... it seems to me THEY don't need not psychedelics to get here if they want to...
At this point... it would be basically impossible to rack "all that" up to my own mind... because for one thing, the beings/dimensions usually communicate very simply that they are independent realities and not just a projection of the mind.
I mean, yeah, projections of the mind, are hallucinations, there is something a bit hollow about them - empty. There is something extremely solid and real about beings from other dimensions... they communicate a dismilarity or aliveness that is strikingly different to one's mental contents or even that of the collective unconsciousness or unconsciousness it seems to me.
Recently, on 4mgs of DOI I was repeatedly visited by a being who I could see in front of me in the arir, clear and transparent and yet solid - detailed. I could feel this being wrap itself around me and suck out energetic toxins from my stomache. I could see and feel its form on my body and feel its sucking motion.
There's much more to the visitations... the being actually left physical matter in my hands which dematerialised into smoke which got onto my clothes and that of my friend.
I went through an incredible healing and release in the energetic complexities of my stomache after this that didn't seem co-incidental. Now, if I didn't EXPERIENCE the reality of the energy body... I am not sure how this healing would have easily occurred... I might have thought I was going mad! ;-)
Now, if I didn't believe in other forms of awareness that operate through a different vessel than that of the physical body... I think it would be hard to comprehend how visitations to other worlds would be possible. If i didn't believe that it was possible for me to experience beings from other realities, if I had a closed mind to that possibility, I doubt that most beings would be interested in trying to open mine up ;-0 - it seems to me they consider that a bit of a waste of time!
This was not a totally unusual experience for me... but it was startling. Clearly, I think keeping an open mind is important to be enable this type of experience to happen.
I'm hearing a lot of closed minds here reeling off the scientific materialistic paradigm as if it was Truth, and I think it's clear that paradigm has already decided a certain singluar description of the world as Truth... and often denies that which challenges or threatens the shape and form of that description.
I think the key to meeting these beings and entering these dimensions is actually being clean and clear enough to be able to cope with it and process it, make use of the experience. Fobbing off supernatural phenomena as just "drug experiences" smacks to me of something akin to psychedelic schizophrenia!
Robert A. Monroe's "Journeys Out of the Body" and "Far Journey's" are highly recommended books to those open and interested enough in the idea of exploring other dimensions.
http://www.amazon.com/Journeys-Out-Body-Robert-Monroe/dp/0385008619
Julian.