Digestive System

There are three organs in the digestive system that scientists say are most harmed by the effects of tobacco use. The first one is the mouth. This includes the lips, oral cavity, and tongue. The second one is the esophagus and the third is the pancreas.

Studies have shown that the stomach is also included in this list, but scientists are not exactly sure how tobacco causes stomach cancer. However, they do know that there is a relationship between tobacco use and stomach cancer.