“Licit and Illicit Drugs”. I read this book while in college and when thinking back about the best books I’ve read, this is in the top 3. It is an outstanding source for historical information about the development of our attitudes towards drugs, the role they play in our society, a straightforward, non-technical presentation of the psychological and biological actions of various drugs, and the effects of our current drug policies. You will be stunned at the destructive role of our government and certain individuals have played on society through misinformation and just plain bad laws.
Sadly, it is out of print, but you can read it on-line at: http://druglibrary.org/schaffer/Library/studies/cu/cumenu.htm