In an on-going debate over the consequences of adolescent employment, there is growing agreement that work intensity (i.e., longer hours) fosters underage drinking and other substance use. The current study furthers our understanding of the relationship between hours of employment and substance use in adolescence by testing whether it is evident across racial/ethnic groups. Based on data from two waves of the National Longitudinal Study of Adolescent Health, the study finds that the effects of work intensity on substance use is mostly limited to whites. Work intensity is not consistently related to alcohol, cigarette, and marijuana use among minority adolescents. (Contains 2 tables and 5 notes.)