I delivered a paper at the Mark Twain Circle/American Humor Conference in
Cancun
last December on Jokes and Metaphor in Mark Twain, using primarily Freud's
_Jokes and Their Relation to the Unconscious_ as critical underpinning.
Marc,
if you (or anyone else) is interested in a copy, e-mail me and I'll try to
e-mail a copy back.  I don't think I touched on cigars, though!

John Bird