title: [Prevalence of tobacco use among teenagers and its relation with family environment].
abstract: OBJECTIVE
  To determine the prevalence of tobacco use among 12-18 year-olds in Biscay (Spain) and its relation with the family environment.
  
  
  METHODS
  We performed a cross-sectional study in 12-18 year-olds. A self-administered, anonymous questionnaire was distributed in different schools of the region selected by stratified sampling, based on the type of school (public school or subsidized private school) and on the linguistic model. The final study sample comprised 1921 students. Information was obtained on tobacco, alcohol and other drug use, as well as on family and sociodemographic characteristics.
  
  
  RESULTS
  A total of 51.8 % of the students had used tobacco. One-third (29.9%) of the teenagers were current smokers and 50.4% were daily smokers. The mean age of first tobacco use was 13.1 +/- 1.85 years. The prevalence of tobacco use was higher in girls and increased with age until the age of 15-16 years. More than 90 % of smokers had experimented with alcohol, 86.3 % had used cannabis at some time and 11 % had used other illegal drugs. In multivariate analysis, the variables associated with a higher odds of smoking were age, female sex, available money, use of other drugs, and smoking by siblings in front of the adolescent.
  
  
  CONCLUSIONS
  The prevalence of tobacco use among 12-18 year-olds increased in relation to female gender, age, having siblings who smoked in their presence, available money, and the use of alcohol, cannabis and other illicit drugs. Maternal and sibling disapproval of smoking may be associated with lower tobacco use among adolescents.
authors: Servicio de Neumología, Hospital Galdakao, Bilbao, España. myriam.aburtobarreneche@osakidetza.net
authors: M
authors: M
authors: Aburto Barrenechea
authors: C
authors: C
authors: Esteban González
authors: J M
authors: JM
authors: Quintana López
authors: A
authors: A
authors: Bilbao González
authors: F J
authors: FJ
authors: Moraza Cortés
authors: A
authors: A
authors: Capelastegui Saiz
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D002648:Child; D003430:Cross-Sectional Studies; D005190:Family / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D015995:Prevalence; D012931:Social Environment; D013030:Spain / Q000453:epidemiology; D011795:Surveys and Questionnaires; D014029:Tobacco Use Disorder / Q000453:epidemiology*