4.6 Article

Prenatal exposure to tobacco and future nicotine dependence: population-based cohort study

Journal

BRITISH JOURNAL OF PSYCHIATRY
Volume 200, Issue 3, Pages 202-209

Publisher

CAMBRIDGE UNIV PRESS
DOI: 10.1192/bjp.bp.111.100123

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Funding

  1. Pfizer
  2. Swedish Council for Working Life and Social Research [2008-0876]
  3. Swedish Research Council [345-2002-35]
  4. Stockholm County Council

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Background Maternal smoking during pregnancy may increase the risk of nicotine dependence, especially in girls, but data are conflicting and confounding by other familial factors cannot be ruled out. Aims To clarify the relationship between prenatal tobacco exposure and adolescent tobacco uptake and dependence in boys and girls respectively, while taking confounding factors into close consideration. Method We conducted a prospective longitudinal study, comprising 3020 Swedish youths followed from 11 to 18 years of age. Exposure and outcome information was elicited via self-administered parental and repeated youth questionnaires. Hazard ratios (HRs), odds ratios (ORs) and corresponding 95% confidence intervals (CIs) were calculated as measures of associations. Results Girls prenatally exposed to maternal tobacco use had a two-to threefold increased odds of experiencing a high number of withdrawal symptoms (OR=2.83, 95% CI 1.68-4.87), craving for tobacco (OR=2.04, 95% CI 1.28-3.32) and heavy tobacco use (five or more cigarettes or snus dips per day) (OR=1.93, 95% CI 1.30-2.86). These associations were weaker among boys, and did not reach formal statistical significance. Associations between prenatal tobacco exposure and onset of regular tobacco use in both genders appeared to be mostly explained by parents' social position and postnatal smoking behaviour. Conclusions Prenatal exposure to tobacco is linked to an increased risk of nicotine dependence among adolescent girls.

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