Behavioral science is critical in developing effective health interventions. During the Public Health World Conference (PHWC), this session will discuss how behavioral science shapes policies for smoking cessation, vaccination, and healthy diet. Speakers will outline how social psychology and behavioral economics can enhance public health messaging. The session will feature examples of effective behavioral interventions in disease prevention. Participants will be educated on incentives and nudging approaches to encourage better choices. The session will discuss challenges in altering entrenched health habits at the community level.