The link between snuff and cancer has been disproven.
http://latimesblogs.latimes.com/booster_shots/2009/07/tobacco-snuff-cancer.html
So on the one hand, you have the National Cancer Institute that says that they are linked. And on the other hand, you have an article in an "open access" forum that says it's only linked in the U.S. but not for scandinavian snuff.
Well I don't have to breathe second hand snuff, so do what you want. Just don't split on the floor in a public building and we'll get along fine.