So we have research from people like Judson Brewer showing decreases in activity and connectivity in the Default (Narrative) Mode Network as a result of meditation.
And research from people like Robin Carhart-Harris showing the similarity of these changes with the changes in the brain on psilocybin.
So we have plausible evidence, maybe not tons of it, that there are at least some similar things going on with respect to meditation and psychedelics. Some kind of overlap.
And then you have someone like me, meditation-wise approaching 2nd path, with at least light access to jhanas up to usually 5 or 6, and finding that my mind seems increasingly sensitive to the effects of psilocybin. Sensitive is almost a good word there. On the one hand, I believe I would be relatively better prepared than the average person to deal with a high dose psychedelic (that may be more due to experiential learning), on the other hand my mind seems increasingly inclined to "take advantage" of the influence of even a very small dose, which seems to be due to the meditation training.
Recently I took a small amount of psilocybin mushrooms, 0.15 grams, and made a tea with 16 oz. of water. The water was then poured into an ice tray made of spaces for 16 x 1 oz. cubes. So each cube has just under 0.01 grams of mushrooms, and considering that the extraction into water was probably not 100%, we're probably realistically talking about something in the ballpark of 0.075 grams of mushrooms. Not very much. At around 0.5% psilocybin by weight, that puts the dose (if my math is correct) at around 0.375 mg of psilocybin, with common doses in research upwards of 15-30 mg.
But I'm getting a very significant effect now from that tiny amount, and I will experiment with even smaller doses. Again, I attribute the effects to meditation. Seems to me no question that the two things are pointing in the same direction.