Interesting. It's funny how Americanized chewing tobacco fell into the mainstream and got away from there roots.
I never understood it. Plug and twist tobacco stores better than say Copenhagen in a fiberboard can, or a plastic can for that matter.
They seen the old timers walking around with their fancy tins of Pipe Tobacco, so they designed a smaller can for chewing tobacco, grinded it up to a fine cut, closely relating itself to old fashioned snuff. When all you had to do was buy you a Plug, or twist, and have chewing and smoking tobacco, in one easy to carry pouch.
This is my own gathering. I would be interested to talk to someone who is knowledgable in this subject matter.