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Banning indoor use removes an incentive for smokers to switch to an alternative that could save their life. E-cigarettes are not burned; therefore, they emit no smoke and pose no danger to bystanders.
One study reported that 77% of daily users of e-cigarettes no longer smoke. Many e-cigarette users first discover the safer devices when they see them being used where smoking isn't allowed. Directing e-cigarette users—most of whom no longer smoke--into smoking areas may endanger their health.