Although 39 years old I think it still applys to many habitual pot smokers today.
Here is a link to list of other books on this website
http://www.druglibrary.org/schaffer/lsd/bookmenu.htmThe book "States of Consciousness" looks really interesting since it was the main topic with me and my old friends about the state of consciousness and how other people perceive it. It looks pretty lengthy so I probably won't read it
Later