You can decrease your risks of getting cancer. True, many cancers are preventable, and your chances of getting others can be dramatically decreased. Healthy living including decreased stress, low fat diets, no tobacco, alcohol in moderation, decreasing sun exposure, and increased exercise can result in decreased cancer risks. Tobacco is a leading cause of many types of cancer. This is true.
Tobacco is a cause of many types on cancer, including lung, mouth, and esophageal cancer.
If you don't smoke, don't start. If you smoke, seek help in stopping as soon as possible. Colon cancer is preventable. This is also true. Low fat, high fiber, diets have been shown to decrease colon cancer rates.