WordNet (r) 3.0 (2006):

mescaline
    n 1: the hallucinatory alkaloid that is the active agent in
         mescal buttons [syn: mescaline, peyote]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "mescaline":
   DET, DMT, LSD, Mary Jane, STP, THC, acid, antidepressant,
   ataractic, diethyltryptamine, dimethyltryptamine, gage, ganja,
   grass, hallucinogen, hash, hashish, hay, hemp, joint, kava,
   marijuana, mescal, mescal bean, mescal button, mind-altering drug,
   mind-blowing drug, mind-expanding drug, morning glory seeds,
   peyote, pot, psilocin, psilocybin, psychedelic, psychic energizer,
   psychoactive drug, psychochemical, psychotomimetic, reefer, roach,
   stick, tea, tranquilizer, weed