Who can possibly know what is in or outside of human biochemistry. It's good to undo all unknown substance to make sure the mind stays strong and sanity remains. It's a lot more comfortable than the point of no return. I hope this is understandable. As I have witnessed it with fully focused and unfocused awareness. Sounds strange, probably is a little bit. Thanks for the light you shining lovers of life, see you at a latter date thanks. Find a good tantra and learn to control the outcome of you visions(GOOD)advice, Never give up until you fully know without judgement, what the practice brings to you,wonderful, family in sky. Ha Ha Ha,