State-Level Structural Stigma and Smoking Among Sexual Minority Adults in the USA, 2012-2014.

Background: Exposure to structural stigma (i.e., societal norms and policies that constrain access to resources) may help explain poor health outcomes among sexual minority (SM) individuals in the USA.
Purpose: We examined the relationship between structural stigma and smoking prevalence among U.S. SM and heterosexual adults.
Methods: We adapted an index to capture multiple state-level structural stigma indicators, including attitudes toward same-sex marriage; the geographical density of same-sex couples; and state-level policies toward SMs. The outcome variable was current smoking, derived from the National Adult Tobacco Survey (2012-2014). Poisson regression models stratified by SM status were used to assess the relationship between structural stigma and the prevalence ratio (PR) of current smoking. We included a squared term for stigma to explore nonlinear relationships between stigma and smoking. Interaction terms were used to examine effect modification by sex.
Results: Adjusted models suggested a curvilinear PR relationship between stigma and smoking for both SM (linear PR = 1.03 [0.97-1.08]; quadratic PR = 0.98 [0.97-1.00]) and heterosexual (linear PR = 1.00 [0.99-1.02]; quadratic PR = 0.99 [0.988-0.995]) adults. The quadratic term was significant (p < .05) for both SM and heterosexual respondents, however, the change in probability of smoking associated with structural stigma was more pronounced among SM individuals. Specifically, the highest and lowest exposures to stigma were associated with the lowest probabilities of smoking. There was no apparent effect modification by sex.
Conclusions: Findings lend support to addressing SM structural stigma as a driver of smoking, particularly among SM adults.
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