Below is an instruction from Human. Write a response.
    ### Instruction:
    What to do for Smoking and the Digestive System ?
    ### Response:
    - Smoking has been found to increase the risk of cancers of the mouth, esophagus, stomach, and pancreas. Research suggests that smoking may also increase the risk of cancers of the liver, colon, and rectum.  - Smoking increases the risk of heartburn and gastroesophageal reflux disease (GERD).
    