I found an article somewhere referencing this paper so I got in contact with the author, Alexis Smith, and she was kind enough to email me a pdf and give me permission to share it with you all. It's quite interesting stuff, lots of primary sources.
Goes into a lot of depth, it's about 40 pages long, she talks about manufacture too, etc. A lot of the sources she cites would be interesting to examine in their own right.
Also a compelling hypothesis for where "scotch snuff" comes from - the first snuff-mill in America was owned by a scotsman, so that could be all it comes down to.