• Vazquez-Nava Francisco, Vazquez-Rodríguez Carlos, Vazquez-Rodriguez Eliza, Castillo-Ruiz Octelina, and Iribar Ibabe Maria.
• Autonomus University of Tamaulipas, Faculty of Medicine of Tamaulipas.
• Afr Health Sci. 2016 Mar 1; 16 (1): 273527-35.

BackgroundRecent publications show that smoking and alcohol use among adolescents with unplanned pregnancy is increasing and the causes need to be further studied.ObjectiveTo determine the association between living in a non-intact family household and the presence of smokers and consumers of alcoholic beverages in the adolescents' environment with smoking and consuming alcoholic beverages in adolescents with unplanned pregnancies.MethodsA cross-sectional study was carried out among 785 pregnant adolescents, aged 13-19 years. Data was collected by trained interviewers using a self-administered questionnaire. The association was determined using multivariate logistic regression analysis.ResultsIn adolescents with unplanned pregnancies, the prevalence of active smoking was 21.2% and of alcohol consumption, 41.5%. The percentage of smoking at home was 57.4% and alcohol consumption, 77.5%. Approximately, 80.3% of adolescents with unplanned pregnancies had friends who smoked and 90.6% consumed alcoholic beverages. Multivariate logistic regression analysis shows that having friends who smoke or who consume alcoholic beverages is the most important risk factor for substance use in adolescents with unplanned pregnancies. Smoking and alcohol consumption at home are not associated with smoking in adolescents with unplanned pregnancies.ConclusionSocializing with friends who smoke and/or consume alcoholic beverages constitutes the most important risk factor for substance use among adolescents with unplanned pregnancies.

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