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If the label shows a date more than 10 years agoor if no date is visibleits best to replace the unit immediately

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The paper, which was published in the Oral Oncology journal, concluded that the tests strongly suggest that electronic cigarettes are not as safe as their marketing makes them appear to the public. "Vapourised e-cig liquids induce increased DNA strand breaks and cell death. Dr Jessica Wang-Rodriguez, chief of pathology at the San Diego branch of the US Department of Veteran Affairs and co-author of the research said evidence to date suggested that e-cigarettes are no better than smoking regular cigarettes." She explained that many studies have shown that nicotine can damage cells, however her team's study indicates that other components in e-cigarettes may be carginogenic