Behavior is a major factor in health and quality of life. Exercise, smoking, diet, ways of handling stress, are all behaviors, and all have huge impacts on health; to promote or damage health. Behavioral medicine uses training, biofeedback, and self-management to treat diseases and to develop healthy behaviors. An emphasis of behavioral medicine is putting the individual in control, by showing how to get control of your own behavior. An additional area of research and treatment: the connection between individual attitude and the immune system. You can actually improve your immune system by improving how you deal with and feel about your life.