Toke-
One possible candidate is the drug PCP (phencyclidine or angel dust), which
when smoked can cause coma in medium to large doses. There are many other
possibilities, but be sure that the route (inhalation) makes sense, as well
as how temperature might affect the toxin. I suggest you take a look at the
book "Deadly Doses: A Writer's Guide to Poisons" by Serita Stevens and Anne
Klarner. Writer's Digest Books, 1990. ISBN:0-89879-371-8.
Scott Sudweeks
