im not denying that psychedelics OFTEN give you cramps, shits, stomach discomfort, etc.
really has nothing to do with the "quality" of the substance, its just a general effect of ANY psychedelic.
strychnine is a fucking old and busted myth though.
http://www.erowid.org
do some reading, its pretty interesting stuff, even if you never intend to do it.
(btw - rolls give me the shits like crazy, when i used to eat them at raves or parties i would have to make sure i took a huge shit before i went to the party, then down some immodium and tums so i didnt spend the whole night in the crapper. suxd)