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To assess the association between the change in statewide smoke-free laws and the rate of preterm or low birth weight delivery hospitalizations. 2002-2013 Healthcare Cost and Utilization Project State Inpatient Databases. Quasi-experimental difference-in-differences design. We used multivariate logistic models to estimate the association between the change in state smoke-free laws and preterm or low birth weight delivery hospitalizations. The analyses were also stratified by maternal race/ethnicity to examine the differential effects