The withdrawal symptoms of thionite aren't absolutely fatal. You're thinking of bloodhype, from the Alan Dean Foster novel of the same name; its high isn't anywhere near as absolute as thionite, but you'll need one hit a day for the rest of your life. That or an incredibly painful and expensive detox course.
--Sam
"If that's art, then art is dirty and weird!"
--Sam
"If that's art, then art is dirty and weird!"