Most people know that smoking causes lung cancer. But it also has been shown to be a major cause of cancers of the mouth, esophagus, kidney, bladder and pancreas.

These symptoms may be caused by esophageal cancer or by other conditions.

Gastroesophageal reflux is best known as a cause of heartburn. However, if severe and untreated, the condition can raise the risk of esophagus cancer.