There are many risk factors for cancer: age, family history, viruses and bacteria, lifestyle (behaviors), and contact with (touching, eating, drinking, or breathing) harmful substances. More than 100,000 chemicals are used by Americans, and about 1,000 new chemicals are introduced each year. These chemicals are found in everyday items, such as foods, personal products, packaging, prescription drugs, and household and lawn care products. While some chemicals can be harmful, not all contact with chemicals is dangerous to your health.