From the Prevent Cancer Foundation website: As more is known about primary prevention and lifestyle changes that can reduce your risk for cancer, most research indicates that starting at a young age is an important factor in adopting lifetime habits. Unprotected exposure to the sun, tobacco use, and childhood obesity are all factors that lead to an increased risk of cancers in adults. You may be at greater risk for some cancers if you have a personal or family history of cancer or certain diseases. To help determine your risk, complete this family medical history chart and share it with your health care professional and other family members.