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Experts believe that racial differences in socioeconomic factors and secondhand smoke exposure may play a role
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Passive smoke exposure normally means second-hand smoke , the smoke exhaled by a smoker plus smoke from the burning cigarette
She updated that review for the World Health Organization in 2015, stepping up the warning by concluding: "Even though no firm conclusions can be drawn on the safety of e-cigarettes, there is an increasing body of evidence indicating harm." "I felt a great responsibility on drawing these conclusions," she said
Respiratory infections: The damaged airways make it easier for infections to take hold, leading to more frequent and severe respiratory illnesses, which can exacerbate symptoms