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To reduce electronic cigarette use, some U.S. states and localities have added vaping restrictions to established smoke-free indoor air laws. 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.