I've found this whole discussion quite interesting, and I do not doubt that our ancestors may have discovered DMT and or/other psychedelics through alchemical practice or other means. I understand how some of this information may have been suppressed, but personally I find it unlikely that it wouldn't have been passed down at least through oral tradition as it was in the Amazon. I also understand that the western, Judeo-Christian worldview can be much more critical of substances such as this, but it makes sense to me that something would have survived in oral tradition, and that we would have known something about it in the western world before the 20th century. Thoughts?