I am not endorsing smoking nicotine products because the other chemicals may cause health problems but according to this search engine nicotine may help with auto-immune diseases

There are other ways to get nicotine than smoking and chewing tobacco. Some of the other ways might cause dental problems but again I would ask if other chemicals than nicotine are involved in causing these dental problems

https://duckduckgo.com/?q=does+nicotine+help+with+autoimmune+diseases&ia=web