Regarding the drugs discussion in here, I agree that it is possible to have spiritual experiences and revelations from certain types of drugs. I do believe that certain plants out there have been created to assist us and help us - we have plants for everything, from pain to sleep problems, to get energized and alert, to improve focus and to relax. And we have plants that can help realize more about ourselves, nature and existence.
But, remember there is also poisonous plants out there, and that goes for the "spiritual" ones too, some things ARE just illusions.
A personal example on this is actually marihuana as being discussed here, around 10 years ago I really felt it helped me spiritually, and that it gave me something, new insights - now 10 years later I realize that it was just illusions and that it really gave me nothing except some wasted time feeling enlightened
At the core we do not need any drugs for anything, though for some people certain plants, psychedelics in this case, can help as a kickstart into the spiritual world, or as a key to open the door and let you have a peek inside so to speak.
But drugs should never replace true experiences, and ones real self, using it frequently will mostly keep you stuck at the same level - or at best a level of self-illusion, as joyful as that may be.
Good luck, and may the inner guide be with you all
-EA