I came up with all of the above questions and thoughts from reading Fell, an incredibly good graphic novel/ comic thing, which introduced this chemical to my understanding of the world.
There are write ups on both Wikipedia and Erowid on this substance and while I have found the information on these sites to be fairly reliable, I wanted to dig deeper to find something official from the U.S. government about this substance. What I found is 37 page long pdf document published in 2008 by the Environmental Protection Agency describing what is known concerning the dangers of human exposure to the drug. The file can be downloaded in pdf form here.
(Updated at 1:05 p.m. PDT): If you like CSI or the police drama genre and you haven't read Fell by Warren Ellis with illustrations by Ben Templesmith
On a related note, I hear snorting bath salts produces similar effects.