An easy example would be the use of tobacco. Tobacco has been linked with different types of cancer such as lung cancer, cancer of the mouth, throat, larynx, pancreas, kidney and cervix.
How to reduce the risk of developing cancer:
Eating a healthy diet will reduce the risk of developing cancer:
-Eating fruits and vegetables
-Limiting processed meats
-And of course, avoiding the high consume of alcohol (having limits).
Maintain a healthy weight and be physically active.