Nutrition and Cancer Quiz True or false: Studies suggest that people who consume lots of antioxidants (vitamin C, vitamin A, and carotenoids) from food sources have a lower cancer risk. Prostate Health Quiz This true/false quiz will help you build your knowledge of steps you can take to prevent prostate cancer. Smoking Cessation, Stages of Change Cigarette smoking is the single leading cause of preventable death and disease in the United States. But because of the physical and psychological addiction to nicotine, smokers find it quite difficult to quit. This video offers important reasons to stop smoking and a framework of change to help you achieve your goal. Cancer Overview Cancer cells don't function properly, and they can spread to many areas of the body. Tumors are clusters of cells that are capable of growing and dividing uncontrollably; their growth is not regulated.