They write about the dangers of chewing tobacco that it harms the gastrointestinal tract, is it when swallowed or does it matter?

 CONSOLE
They write about the dangers of chewing tobacco that it harms the gastrointestinal tract, is it when swallowed or does it matter?
The question is a bit silly. After reading articles about the dangers of snus, you can get unwanted sores in the stomach and intestines such as ulcers. Do these sores appear when saliva is swallowed during "chewing", or when it enters through the mucous membrane of the gums?

Answers:

IIK
Spit - do not spit, but some of the shit will still fall into the stomach. Tobacco for smoking.