Bullshit!
Says who? I have done it both wet and dry many many times and never experienced that, and I've talked to people online about it a lot and nobody has mentioned that. So where are you getting this claim? I say that knowing that there are groups trying to make it illegal that have been spreading lies including that ibotenic acid causes brain bleeds based on a single discredited study repeated ad nauseam.
You are on some Reefer Madness bullshit aren't you? Admit it!