Why do cigarettes give you canker sores?

There is no direct link between smoking cigarettes and developing canker sores. Canker sores are small and shallow ulcers that can appear inside the mouth. They can be caused by various factors such as stress, hormonal imbalances, certain foods, autoimmune conditions, and injuries to the mouth. While smoking can indirectly contribute to the development of canker sores due to its negative effects on the immune system and overall health, it's not a direct cause.