There is no evidence of that. What you say is not supporting, but rather "conveniently makes sense".
I don't dispute the utility of psychedelics. But I have observed (and this is anecdotal) that the fanatic devotees of the drugs tend to engage in magical thinking around the power/history/whatever of psychedelic substances, no matter their intelligence or accomplishment, or rigorous critical thinking in other areas.
Reconciling the profound interiority of the experience with a mere external catalyst can be quite challenging.
Consider the question yourself next time you are in the throes of an exoerience and see how hard it is to maintain objectivity...
It’s a controversial theory, but it does exist[0]. As far as I know, there is no prevailing theory about where consciousness came from so speculating based on existing theories isn’t claiming it’s the truth.
Is it such a leap that fungi are one of the few natural drugs that cause brain elasticity so maybe our early ancestors took it to get the evolutionary process started.
0. https://en.wikipedia.org/wiki/Stoned_ape_theory
One of the reasons this is such a long bow to draw is that, as you have absurdly reiterated and an earlier commenter posited, this is Lamarckism. If it is true, where are all the sapient reindeer and other animals that have consumed these substances as a species for as long or longer than we have existed?
I'm aware of the theory. I'm not aware of any explanation offered by the theory as to how those who first experienced consciousness via psychedelics managed to pass consciousness on to their descendants. It doesn't make any sense. If you cut the tail off a rat, it doesn't have tailless children.