Smoking tobacco is linked to developing canker sores. It might irritate the mouth tissues, causing breakouts or make existing mouth ulcers worse. Additionally, the nicotine may reduce the amount of blood that flows to the mouth and gums, which may then slow down the healing process.

Smoking Cessation

Some studies show us that people who quit smoking often develop canker sores in the first 2 weeks after cessation which mostly resolve by the 4th week.