title: A multilevel analysis examining the relationship between social influences for smoking and smoking onset.
abstract: OBJECTIVE
  To examine how older smoking peers at school and the smoking behavior of friends and family members are related to youth smoking.
  
  
  METHODS
  The School Smoking Profile was used to collect data on tobacco use and determinants of tobacco use from 22,091 students from 29 secondary schools in Ontario, Canada. Correlates of occasional and regular smoking were examined using multilevel logistic regression analyses.
  
  
  RESULTS
  Students are at increased risk for smoking if they (a) have smoking friends, (b) have smoking family members, and (c) attend a school with a relatively high senior-student smoking rate.
  
  
  CONCLUSIONS
  These findings suggest that prevention programs should target both at-risk schools and at-risk students.
authors.affiliation: Cancer Care Ontario, Division of Preventive Oncology, 620 University Avenue, Toronto, ON, Canada. Scott.leatherdale@cancercare.on.ca
authors.forename: Scott T
authors.initials: ST
authors.lastname: Leatherdale
authors.forename: Paul W
authors.initials: PW
authors.lastname: McDonald
authors.forename: Roy
authors.initials: R
authors.lastname: Cameron
authors.forename: K Stephen
authors.initials: KS
authors.lastname: Brown
mesh_terms: D000293:Adolescent; D017668:Age of Onset; D003625:Data Collection; D005260:Female; D006801:Humans; D008297:Male; D009864:Ontario; D012044:Regression Analysis; D012574:Schools; D012907:Smoking; D012919:Social Behavior; D012931:Social Environment