Green Man... as I have mentioned before the use of the term "addictive personality" is gratuitous, non-informational, and pejorative. It's a way of blaming the victim, IMHO.
I have to keep up with the literature on street and prescribed pharmacology for my license. I recommend to anyone interested the following:
A Primer of Drug Action: A Concise, Nontechnical Guide to the Actions, Uses, and Side Effects of Psychoactive Drugs. (2000) Robert Julien MD. PhD. Freeman & Co New York. Chapter 11: Marijuana: A Unique Sedative-Euphoriant-Pyschedelic Drug.
This chapter talks extensively about the cannibinoid recepters, where they are in the brain and effects in humans and primates.