title: Mental health problems and smoking among adolescents from Southern Brazil.
abstract: OBJECTIVE
  To analyze the association between mental health problems and smoking in adolescents.
  
  
  METHODS
  A total of 4,325 adolescents aged 15 from the 1993 birth cohort of the city of Pelotas, Southern Brazil, was studied. Smoking was defined as having smoked one or more cigarettes in the previous 30 days. Mental health was assessed according to the total score of the Strengths and Difficulties Questionnaire. Score > 20 points was considered positive. Data were analyzed using Poisson regression with adjustment for robust variance.
  
  
  RESULTS
  Smoking prevalence was 6.0% and about 30% of the adolescents presented some mental health problem. In the crude analysis, the prevalence ratio for smoking was 3.3 (95%CI 2.5; 4.2). After the adjusted analysis (for sex, age, skin color, family income, mother's level of schooling, group of friends who smoke, employment in the previous year, school failure, physical activity during leisure time and experimental use of alcohol), it decreased to 1.7 (95%CI 1.2; 2.3) among those with mental health problem.
  
  
  CONCLUSIONS
  Mental health problems in adolescence may be related to tobacco consumption.
authors: Universidade Federal de Pelotas, Pelotas, RS, Brasil. anamene@terra.com.br
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