Agaricus is bringing a degree of sanity to the discussion - is this allowed?
The ancient Romans actually ingested the stuff as a laxative......I knew a guy who in the course of medical experiments had a tube containing the stuff burst in his stomach, and he said that the ancient Romans certainly had an effective answer to constipation. Gave him a somewhat 'heavy' feeling!
I figure the real worry is, as so many have said, the corrosion problem.