Smoking has become increasingly socially unacceptable in the United States, and the change coincides with a decline in tobacco use. This growing social unacceptability raises an important new question: Do people who smoke think they are stigmatized? Stigmas may function as a source of social control, contributing to smokers' decisions to quit in order to avoid stigmatization and social exclusion. However, smoker-related stigmas may have counterproductive consequences for smokers if stigmas encourage secrecy and social withdrawal from nonsmokers. This study, based on a random survey of smokers in New York City, provides new measures of perceived devaluation, perceived differential treatment due to smoking, social withdrawal from nonsmokers, and concealment of smoking status. Forty-four percent perceive devaluation and 17 percent report experiencing differential treatment due to smoking. In short, the results suggest that the stigmatization of smokers is a potentially powerful and unrecognized force, one that may have counterproductive consequences.