Are state-level income-based disparities in adult smoking declining?

The United States (US) has identified income-based disparities in smoking as a critical public health issue, but the extent to which these disparities are changing over time within states is not well documented. This study examined recent trends in current cigarette smoking in each state and the District of Columbia by self-reported annual household income. Data came from the Behavioral Risk Factor Surveillance System, a state-representative survey of US adults. Sample sizes for each state and year ranged from 2914 to 36,955 participants. We fit logistic regression models to examine linear time trends in cigarette smoking status in each state between 2011 and 2017. In every state, the odds of smoking were 1.4 to 3.0 times greater in the lower-income group as compared to the higher-income group in 2017. Among 47 states, linear time trends in smoking did not significantly differ by income group, suggesting no change in income-based disparities. In three states (Florida, Maine, West Virginia) disparities widened, primarily because smoking prevalence only dropped among higher-income groups. Disparities declined in only one state. In New York, smoking prevalence declined more for lower-income groups compared to higher-income groups. Findings from this study suggest that little progress has been made toward reducing income-based differences in smoking and additional policy and tobacco control efforts may be required to meet national disparity reduction goals.