here you go....
http://www.erowid.org/entheogens/entheogens.shtml

there are a few of them....which include cannabis and tobacco....according to erowid

defenition: http://www.erowid.org/psychoactives/...ives_def.shtml

i also searched on this site for the word Entheogens and it came up with loads of threads.....how relevent they are is up to you to decide.

hope this helps....