Describes the role tobacco plays in various kinds of cancers. Identifies the impact of estrogens, and viral and bacterial pathogens, on the development of cancer. Describes the lifestyle and dietary changes that can help prevent the development of cancer. Discusses the benefits and drawbacks associated with some of the tools used to screen for cancer. Identifies the role of chemopreventive agents, and how they may be able to curtail the onset of cancer, or its recurrence.