Previous research conducted in the United States has shown that truancy increases the risk of marijuana use among adolescents. The current study examines this relationship in Chile. By using a longitudinal study conducted from 2008 to 2011 among school students in 7th grade in Santiago, Chile, I test the effect that truancy has on the onset of marijuana use, controlling for a number of potential confounders. The findings support the hypothesis that youths who reported having been truant were more likely to initiate marijuana use. However, I did not find enough support for the hypothesis that youths who reported have skipped schools more days were at a higher risk of initiating marijuana use.