• Abigail S Friedman, Jon F Oliver, and Susan H Busch.
• Department of Health Policy and Management, Yale School of Public Health, New Haven, CT, USA.
• Addiction. 2021 Aug 1; 116 (8): 2198-2206.

Background And AimsIn the United States, some states and localities have added vaping restrictions to established smoke-free indoor air laws in order to reduce electronic cigarette use. Yet, if smokers use e-cigarettes to quit, such restrictions could have the unintended effect of attenuating the original smoke-free air policy's effects on smoking. This study estimated changes in current smoking, past-year smoking cessation, and recent vaping following the introduction of smoke- and vape-free air laws.DesignObservational study of nationally representative data from the 2014-2018 National Health Interview Survey.SettingUnited States.Participants/Cases87 334 participants, 18-54 years of age.MeasurementsMultivariable linear regressions estimated the association between increased exposure to smoke- and vape-free worksite and restaurant laws and self-reported current smoking and recent vaping among emerging adults (ages 18-25), as well as past-12-month smoking cessation among prime age adults (ages 26-54). All regressions adjusted for respondent sociodemographic and other tobacco control policies, along with state and year fixed effects.FindingsSmoke-free worksite laws were associated with significant reductions in the likelihood of current smoking ( β ̂  = - 0.050, 95% CI: -0.098, -0.002, P = 0.038) and recent vaping ( β ̂  = - 0.040, 95% CI: -0.072, -0.007, P = 0.013), as well as increases in the likelihood of smoking cessation ( β ̂  = 0.026, 95% CI: 0.000, 0.052, P = 0.046). Adding vaping restrictions to smoke-free worksite laws did not yield further reductions in recent vaping ( β ̂  = 0.008, 95% CI: -0.021, 0.036, P = 0.568) and counteracted over half of the estimated association with current smoking relative to smoke-free policies alone ( β ̂  = 0.030, 95% CI: -0.028, 0.088, P = 0.301).ConclusionsFrom 2014 to 2018, increased adoption of smoke-free worksite laws in the United States was associated with reductions in both current smoking and recent vaping, as well as increases in smoking cessation. Adding vaping restrictions to smoke-free worksite laws, however, was not associated with a reduction in recent vaping among emerging adults and may have attenuated the smoke-free policy's impact on current smoking in this age group.© 2021 Society for the Study of Addiction.

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