Objectives. We compared the association between 3 different definitions of social smoking—a common pattern of smoking among young adults—and cessation indicators. Methods. We used a Web-enabled, cross-sectional national survey of 1528 young adults (aged 18–25 years) from a panel (recruited by random-digit dialing) maintained by the research group Knowledge Networks. Results. Among 455 smokers, 62% self-identified or behaved as social smokers. Compared with established smokers, self-identified social smokers were less likely to have cessation intentions (odds ratio [OR] = 0.83; 95% confidence interval [CI] = 0.70, 0.98) and cessation attempts lasting 1 month or longer (OR = 0.54; 95% CI = 0.45, 0.66). Behavioral social smokers (mainly or only smoking with others) were more likely than were self-identified social smokers (those who did not report these behavior patterns) to have cessation intentions (mainly ORmainly = 1.66; 95% CI = 1.05, 2.63; and ORonly = 2.02; 95% CI = 1.02, 3.97) and cessation attempts (ORmainly = 4.33; 95% CI = 2.68, 7.00; and ORonly = 6.82; 95% CI = 3.29, 14.15). Conclusions. Self-identified social smokers may be considered a high-risk group with particular challenges for cessation. Behavioral social smokers may represent a group primed for cessation. Public health efforts should address these differences when developing smoking cessation strategies