No I think the evidence is clear enough that soma in relation to the blue throated peacock was psilocybin active species of mushrooms, which ties right into the peacock stage of alchemical transformaton where one begins to see colored patterns..this stage marks a major shift in the alchemist as they move into the deeper mysteries. There was likely not only one soma mushroom, but a number of them described as various meats..the meat of the elephant was likely to be psilocybe cubensis..as the meat of the buffalo was likely to have been panaeolus combodginiesis. There is also references to the dung eaters and urin drinkers..the dung obviously being psilocybin species that grow on animal dung, and the urin drinkers referring to the amanita muscaria mushroom..which is also interesting in my limited but recent experience. Mike Crowley has a large body of work on this on his site "secret drugs of buddhism". I paid for a membership to get full access to his research and it was worth every penny.
Durring the rise of buddhism, the fall of the vedic systems and rise of orthodox brahmanism was likely already in place..including the suppression of soma. It makes sense it would be veiled somewhere within buddhist teachings, out of sight for those not initiated...I am no scholar though.
Acacias are reported to be in use in secret buddhist innitiations(nen 2014) by one Lama as a snuff, and in the himalaya region a number of mushrooms are recognized and known as "traveling mushrooms". Psilocybe cubensis is one mushroom, dried and made into a snuff with amanitas and other plant admixtures. The snuff is called "thapana" and stored in reed tubes(Ratsch).
According to Mike Crowley, in Vajrayana buddhism there is still a placebo sacrament used called amrita used heavily in innitations(Crowley).
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On a side note..a little bit about the idea of "illusion". I don't like this term, as it if often referenced in western circles, at least in vedic contexts. The teachers of advaita vedanta that I currently vibe with, teach that this is mistranslation. This is the causal reality..the reflectional reality..but not an illusion in the sense that it is not real. It IS real..as is brahman..and the reflectional reality IS brahman..and it is where we live...as do all gurus, sages etc...amd not to be denied..however it is not the truest, or highest realized aspect of brahman, because it is still causal, and brahman is the unchanging stillness of reality. It is permanence. All movement towards that place in the clear light, begins in the causal realm..and flows back down into the causal realm. The vedantist, though the practice of discernment can live free from suffering in the reflectional reality, through non attachment. Non attachment however does not mean non-action(in my opinion). I am so put off by a major chunk of what I hear said about vedanta, buddhism, christianity, Islam and Gnosticism etc in the west and new age circles that I rather tend to just not talk about it with many people, because the don't get it, and resort to popular cliches like "namaste" and "it's all one!" while inserting the latest cultural suppository Jehova is handing out
..please don't burn me yet!
In the clear light of god, there is not even non attachment to attach to..yet here remains still, that existential ache..that nostalgic longing for our true home in the pleroma..and it becomes the great work of our very soul to illuminate that divine spark within, and light up the world...
..and just because you have peered into the depths of that light, as it shines through the caked on dirt of your own humanity, does not mean that the world suddenly lightens up to you...not at all. Internally, it brings peace. The archons of this world are many, and you may well have just set off your light beacon. Ego's don't enjoy being threatened. Buddha and Jesus ain't drivin no lexus any time soon. Ooops.. Sorry, The Secret..but we have had enough of your new age babylon drivel..don't worry though, Im sure your check will come in soon enough, and you can sit with the rest of the washed up gurus alongside depak and tolle on the shelves of your nearest Wal-Mart.
"it's hard to find the moral high ground when we're all standing in the mud."
- Phelan
"don't hate the player, hate the game...because the game hates you"
-Miguel Conner
....annnnddd yeah can't help but post this one so if your still not ready to nail to that cross... 
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Oh well, I digress.
Compassion is the only virtuous virtue.