VR can immerse participants in realistic simulations of real-world environments to investigate health behaviors (environments meant to trigger cravings for drugs, alcohol or nicotine). These simulations that evoke feelings (addiction cravings) can be valuable aid in research & evaluating the efficacy of experimental treatments and interventions. VR can be adapted to simulate the consequences of unhealthy behaviors using body illusions, wherein the users’ own physical appearance or abilities have changed in response to their health behaviors.