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This investigation focused on substance use among children who regularly care for themselves after school (latchkey children). The data, collected from 4932 eighth-grade students, indicated that self-care is an important risk factor for alcohol, tobacco, and marijuana use. Data collected from 2185 parents validated these findings. Eighth-grade students, who took care of themselves for 11 or more hours a week, were at twice the risk of substance use as those who did not take care of themselves at all. This relationship held at all levels of sociodemographic status, extracurricular activities, sources of social influence, and stress. Of the 186 stratified tests of the relationship, 90% were significant; even those not found to be significant were in the direction expected. Path analyses suggest that risk-taking, having friends who smoke, and being offered cigarettes may partially explain the relationship between self-care and …