This chart is taken from ABC news.com
Guidelines for a healthy, cancer-free life:
1. Eat plenty of fruits and vegetables
2. Exercise regularly
3. Avoid tobacco smoke, fats, red meats, excessive alcohol consumption
4. Avoid long exposure to midday sun
5. Avoid risky seual practices
6 Avoid contact with known carcinogens in the environment.
The above information is summarized from the Scientific American's special issue on Cancer, 1996