I will second this, for my part. I have never used hallucinogenics but have used other "substances" which can cause one to "meet God" momentarily, but the effect does not last. Drugs are a bad way to go, and I would recommend them only for the most feeble-minded who have no hope of insight otherwrise. I know that David was a pot smoker for a fairly brief period, and "someone who isn't me" has also experimented with the synthetic pot - which is actually up to up to 800 times more potent than natural THC. Needless to say, a big hit of that can put "someone who isn't me" in quite a zoned-out state - but it is important to recognize everything that appears as merely projections of the mind (aka "delusions") and nothing more, or confusion may result.Be very careful of drug experiences, particularly weed and LSD. They can so easily deceive the mind, and they can lead you to think that you are far more enlightened than you really are.
"You reached for the secret too soon", sang Roger Waters of Syd Barrett's downfall.
Even though it may contain a good deal of superstitious nonsense, I would recommened reading the "Tibetan Book of the Dead" thoroughly before trying any drug experience aimed in a spiritual direction. You don't have to take it literally, but it will certainly help you understand that whatever appears to you is merely another projection of the mind, and you should shoot for the perfect immediate clarity of reality - even if it becomes almosy unbearably close to you due to your brain state. That's when the magic will happen, if at all. One has to learn to tolerate reality to have any chance of enlightenment, I think.
I think David knows more about this than he prefers to let on, at least frequently."Someone who isn't him" knows of what I speak.