I wasn't saying that the church did something evil, I just wanted to throw this tidbit in. But yes, Bilsenkraut isn't something you want to really take, like I said, the lethal dose is extremely near to the dose you need to get high (which also isn't much).
Another interesting tidbit, european shamans peed out of their window after taking drugs (which I guess was very common back then), and other people gathered around it to catch the pee and drink it since it still had enough of the drug in it but wouldn't kill you (*)

(*)disclaimer: Doesn't work with every drug, you might some of the rare edgecases who dies right after taking just a little bit of the drug. Don't try this at home!