(1) Simply, the study of pot. Marijuana, cannabis..etc. (2) It is indeed all that is known about cannabis from its scientific and intellectual study. The first (and maybe only) book of this title is 'Potology: Dr Nuke's Guide to The Science of Cannabis and the Sociology of Getting Stoned' (Manchester: Lifeline Publications; 1994) by Dr Russell Newcombe, and illustrated by Michael Linnell. See the website of Linnell Communications (Michael Linnell) for more information, and hopefully, soon, a free download of Potology (still available on Amazon).