RT Journal A1 Shakya HB, Christakis NA, Fowler JH T1 PArental influence on substance use in adolescent social networks JF Archives of Pediatrics & Adolescent Medicine JO Archives of Pediatrics & Adolescent Medicine YR 2012 FD December 1 VO 166 IS 12 SP 1132 OP 1139 DO 10.1001/archpediatrics.2012.1372 UL http://dx.doi.org/10.1001/archpediatrics.2012.1372 AB Objective  To evaluate the relationship between the parenting style of an adolescent's peers' parents and an adolescent's substance use.Design  Longitudinal survey.Setting  Adolescents across the United States were interviewed at school and at home.Participants  Nationally representative sample of adolescents in the United States.Main Exposure  Authoritative vs neglectful parenting style of adolescent's parents and adolescent's friends' parents and adolescent substance use.Main Outcome Measures  Adolescent alcohol abuse, smoking, marijuana use, and binge drinking.Results  If an adolescent had a friend whose mother was authoritative, that adolescent was 40% (95% CI, 12%-58%) less likely to drink to the point of drunkenness, 38% (95% CI, 5%-59%) less likely to binge drink, 39% (95% CI, 12%-58%) less likely to smoke cigarettes, and 43% (95% CI, 1%-67%) less likely to use marijuana than an adolescent whose friend's mother was neglectful, controlling for the parenting style of the adolescent's own mother, school-level fixed effects, and demographics. These results were only partially mediated by peer substance use.Conclusions  Social network influences may extend beyond the homogeneous dimensions of own peer or own parent to include extradyadic influences of the wider network. The value of parenting interventions should be reassessed to take into account these spillover effects in the greater network.