Cigarette butt littering is a widespread yet socially tolerated environmental issue, unlike other littering behaviors that face stronger social disapproval. This project investigates why norms against cigarette butt littering are weaker and whether cor-recting misperceptions about its environmental and financial impact can shift be-havior. Using a survey experiment, I will compare cigarette butts to other littering behaviors to examine what drives norm formation. Participants will receive factual information on the environmental and financial impact of different types of litter to test whether updating beliefs influences perceived social expectations and disposal choices. The findings will inform policy interventions by assessing whether norm-based nudges can complement traditional economic incentives, such as fines or de-posit schemes. By bridging insights from behavioral economics and social psycholo-gy, this research aims to identify effective strategies for reducing littering behavior at scale.