i'm new to this, but it's fun to see all the responses. on your advice, i went to google and searched "rectal smoke" and got 14,000+ listings (to be honest there were zero listings for the 2 words together, but separately a whole gob. anyway, this web site is a paper on rectal analgesia which among other practices mentions the use of tobacco smoke up one's ass for analgesic effect.
http://www.asahq.org/NEWSLETTERS/1998/09_98/Develop_0998.html
hey why does it say "stranger" under my name? i don't remember putting that in my profile.