Longitudinal Effects of Peer, School, and Parenting Contexts on Substance Use Initiation in Middle Adolescence.

Purpose: Preventing substance use initiation (SUI) can reduce negative consequences associated with adult substance use disorder. The role of involvement with deviant peers, school connectedness, and parenting quality on SUI was investigated among a community sample (N = 387).Method: PROCESS tested whether three parenting quality factors (Parental Knowledge and Affective Relationships, Parental Control, and Parental Communication and Involvement) served as moderators of two different mediation pathways (involvement with deviant peers and school connectedness) on three SUI outcomes (alcohol, cigarettes, and marijuana).Results: Involvement with deviant peers mediated the relation between school connectedness and substance use. Low school connectedness predicted high deviant peer affiliation, which, in turn, predicted high SUI. School connectedness did not mediate involvement with deviant peers and substance use. Parenting quality factors were not significant moderators.Conclusion: Supporting adolescents who lack strong school connections may help prevent involvement with deviant peers, which, in turn, may prevent SUI.