Based on previous research, I hypothesize that religious adolescents living in the United States are more likely to have a future orientation (i.e., they are more likely to think about the future), which in turn contributes to their greater self-control. I also hypothesize that a future orientation and self-control mediate the effect of religious service attendance and importance of religion on adolescent marijuana use. Based on the second wave of the National Study of Youth and Religion (NSYR), I find partial support for these hypotheses. Adolescents who believe that religion is important are more likely to think about the future, and adolescents who attend religious services frequently are less likely to use marijuana. Contrary to expectations, however, adolescents who think more about the future have lower self-control and thinking about the future and self-control do not explain the relationship between religious service attendance and marijuana use. The results also suggest that adolescents who identify as spiritual but not religious have lower self-control, and use marijuana more frequently compared to adolescents who do not identify as spiritual but not religious.