Violence against children and later substance use in low- and middle-income countries

Background: Globally, one in two children experience violence; experiences which may lead to later risky behaviors such as substance use. In low- and middle-income countries (LMICs), however, the association between childhood violence and substance use remains underexplored. Objective: This study assessed the association between childhood violence and substance use among LMIC youth. Participants: Data from the Violence Against Children and Youth Surveys (VACS) in eight LMICs (2017-2019) were analyzed, comprising 33,408 children and young adults (ages 13-24). Methods: Exposure variables included the experience of childhood violence (physical, sexual, emotional) and polyvictimization (experience of two or more types). Outcomes were current smoking and past-month alcohol and drug use. Multivariable logistic regressions with countryfixed effects were estimated. Stratified analyses were performed based on participant's sex and age, and effect modification analyses examined whether associations differ by the presence of peer support. Results: Childhood physical violence was the most prevalent type of violence (40.7 %), and about 10 % of the participants experienced polyvictimization. All types of violence increased the odds of smoking, binge drinking, and drug use, and polyvictimization elevated the risk substantially. Stronger associations were observed in young women with a history of childhood sexual violence (current smoking aOR: 1.5, 95 % CI: 1.2-1.9; binge-drinking aOR: 2.1, 95 % CI: 1.7-2.5; and drug-use aOR: 2.3, 95 % CI: 1.5-3.5) compared to young men. Additionally, the associations between childhood sexual violence and substance use were more pronounced among adolescents (current smoking aOR: 1.7, 95 % CI: 1.2-2.2; binge-drinking aOR: 2.3, 95 % CI: 1.8-2.9; and drug-use aOR: 2.4, 95 % CI: 1.5-3.9), relative to young adults. Lack of peer support significantly increased the likelihood of drug use. Conclusion: Childhood violence prevention programs can reduce substance use in LMICs, and they should take into account the survivor's sex and age. Our findings suggest that peer support can mitigate risky behaviors among the survivors of childhood violence.