didn't soldiers in (I think) WW2 used to piss into rags and use it as a mask to counter some sort of gas (mustard maybe?). If I'm correct...I'll make a leap and say that anything that can counter mustard (or something similar) gas is probably not good to consume in any reasonable quantity? Kind of like caustic and acidic substances. Everybody knows that acid is bad for the skin...but not many people think about extremely caustic substances like lye (spelling?) for soap.