The present study investigated the moderating role of positive emotions on the associations between self-control and social support with gambling and water-pipe smoking. One hundred fifty-five adolescents aged 12-19 (M=16.19) were contacted in 2011 at five centers for at-risk youth in Israel. Self-report findings indicated that positive emotions moderated the associations between peer social support and gambling and between self-control and water-pipe smoking. Among adolescents with higher rates of positive emotions, higher rates of self-control skills contributed to lower frequencies of water-pipe smoking. In addition, among adolescents with higher rates of positive emotions, higher levels of social support contributed to non-involvement in gambling behavior. The discussion centers on the mechanisms that can enable positive emotions to activate personality-related and environmental resources to curb adolescent risk behaviors.Keywords Adolescents . Positive emotions . Risk behaviors . Self-control . Peer social support During normal adolescent development, many youngsters engage in short-lived risk behaviors as a means to explore and experiment with personal and behavioral boundaries (Dworkin 2005) and as expressions of independence that can potentially yield social rewards among peers (Pickett et al. 2002). Risk behaviors-actions that may directly or indirectly harm youngsters' well-being, health, and life path-include the use of psychoactive substances, violence, drunk-driving, unsafe sex, gambling etc.