I won’t presume to suggest a cause, but it’s worth acknowledging how terrifying it is that any of a number of compounds in a relatively small dose could cause wild effects on the human mind or body.
https://www.bu.edu/sph/news/articles/2019/central-american-k...
https://www.npr.org/sections/goatsandsoda/2019/08/26/7538343...
Botulinum toxin has an LD50 of a couple of nanograms per kg of body weight, which makes it especially mad that people use it in a fairly loose fashion for cosmetic skin tightening.
So it's not entirely _impossible_, but I agree it doesn't seem very likely.