title: The association of the transitions in smoking stages with prevalence of cigarette smoking in the classes and schools: a longitudinal study.
abstract: BACKGROUND
  Adolescent tobacco use remains a major public health priority to reduce the prevalence of tobacco use in community. The aim of this study was determining the association of the transitions in smoking stages with prevalence of cigarette smoking in the classes and schools in adolescents of Tabriz City (northwest of Iran).
  
  
  METHODS
  Fifty-six high schools were randomly selected, and 4903 students completed a self-administered questionnaire on cigarette smoking twice with a 12-months interval in 2010 and 2011.
  
  
  RESULTS
  Transition from experimenter to regular smoker stage was associated with the prevalence of cigarette smoking in the school.
  
  
  CONCLUSIONS
  The results have shown the association of student's smoking uptake with the prevalence of cigarette smoking in the school. This highlights the importance of enforcing smoke free policies in schools.
authors.affiliation: Department Human Nutrition and Food Safety, School of Public Health, Qazvin University of Medical Sciences, Qazvin, Iran. poorasl@yahoo.com.
authors.forename: Asghar
authors.initials: A
authors.lastname: MohammadPoorasl
authors.affiliation: Department of Epidemiology and Biostatistics, School of Public Health, Knowledge Utilization Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Saharnaz
authors.initials: S
authors.lastname: Nedjat
authors.affiliation: Clinical Psychiatry Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Fakhari
authors.affiliation: Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Akbar
authors.initials: A
authors.lastname: Fotouhi
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D016014:Linear Models; D008137:Longitudinal Studies; D008297:Male; D015995:Prevalence; D012574:Schools / Q000706:statistics & numerical data*; D012907:Smoking / Q000453:epidemiology* / Q000523:psychology; D066262:Social Norms; D011795:Surveys and Questionnaires
keywords: Longitudinal study; Smoking stages; Smoking uptake