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E-cigarette vapor non-toxic to human lung cells in lab tests

(R&D at British American Tobacco) Vapor from e-cigarettes is non-toxic to human lung cells under normal usage conditions. But even when tested using extremely unrealistically high doses, e-cigarette vapor proved to be significantly less toxic to human lung cells than cigarette smoke. Cigarette smoke was cytotoxic even at levels typically observed in real life use. And lung cells exhibited low levels of cytotoxicity only after exposing cells to a vapor amount equivalent to a day's exposure in just one hour.
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