Looking at the World Health Organization document on smokeless tobacco, it appeared they pulled much of their history from a journal article titled: “Smokeless Tobacco: The Folklore and Social History of Snuffing, Sneezing, Dipping, and Chewing.”
I looked around a bit, and found a PDF of that article. You can read it or download it here:
http://www.modernsnuff.com/books/journal\\_article\\_by\\_Christen.pdf
Enjoy… :-)
Mark