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As e-cigarettes gain fans, children may be losing out. New research suggests that vaping parents expose children to secondhand fumes that may be as harmful as tobacco smoke. Nearly 5% of U.S. adults living with children use e-cigarettes, according to the study. And many of those kids have asthma. "Although e-cigarette aerosols are commonly perceived to be harmless vapors, they contain numerous potentially harmful chemicals," said lead researcher Jenny Carwile.