Can Smokeless Tobacco Cause Diabetes Can Quitting Smokeless Tobacco Cause Excessive Coughing And Phlegm? (my Dad, Not Me)?

Can quitting smokeless tobacco cause excessive coughing and phlegm? (my dad, not me)? - can smokeless tobacco cause diabetes

My father has recently quit smoking tobacco, snuff, stop smokeless tobacco, and more recently coughing their lungs much more than they did when he was still under water. Never let the tobacco does not cause the same kind of excessive mucus in the body again natural filtration, as to quit smoking?