Child marriage and exposure to secondhand smoke among women of childbearing age: evidence from a nationally representative study in India.

Women in low-and-middle income countries (LMICs) are disproportionately exposed to secondhand smoke (SHS), particularly in the home environment. Girls married before the age of 18 are more likely to remain at home and may be at higher risk of SHS exposure. This paper investigates whether women who were married as child brides had a higher risk of SHS exposure than their peers who were married as adults in India, where both burden of smoking and child marriage are critical public health concerns. Data were obtained from the 2015-2016 wave of the nationally representative India National Family Health Survey and included 306,788 married women ages 18 to 35 years. We estimated bivariate and multivariate logistic regressions to obtain odds ratios in favor of SHS exposure. The prevalence of SHS exposure for those who were married as adults was 50.3% while that was 55.2% for those who were married before age 18. After controlling for sociodemographic characteristics, the adjusted odds of SHS exposure for those who were married as child were 1.06 (95% CI: 1.03, 1.09) times that of those who were married as adults. Findings of this study inform policies for coordinated efforts to eliminate child marriage and strengthen tobacco control.