Behavior modification to reduce the risk of developing cancer is a major public health concern due to health care costs associated with individuals being treated for cancer. Behavior change falls squarely within the interests of the field of psycho-oncology due to the psychological factors associated with implementing behavior change. Chief among behaviors that are targeted to decrease individuals' risk for cancer are smoking and alcohol consumption, diet and exercise, and sun exposure. These health behaviors are known to increase the likelihood of developing cancer in addition to myriad other health conditions.