I am not so sure snuff is not without its drawbacks. Handkerchiefs being one, use tissues. And anything that you inhale will end clogging the lungs, to whatever extent. The mucus may dissolve it but there are clues with analogues, like Pneumoconiosis. Sawdust is a good comparison, plant based fine dust, bacteria need oxygen to eat it - (in your lung?).

Sawdust is a known carcinogen, indeed in the days of sawpits, the guy at the bottom of the pit was paid more, because he might not live as long!

Snuff is still a very effective way to get the immuno-suppressive nicotine into the bloodstream. And whatever else is present in snuff, like peppermint etc.

And there is always that product called Skaols, teabags of tobacco you put under the tongue. It didn't catch on 40 years ago. But was a more refined version of chewing tobacco.