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In that study, conducted among 64 daily e-cigarette users (59 using second- and third-generation devices and 5 using first-generation cigalikes), the levels of chromium and nickel were measured in several samples collected from the e-cigarette device (dispenser, aerosol, and tank) used by the participant, as well as in several biomarkers collected non-invasively: urine, saliva, and exhaled breath condensate (EBC)

Not only that, being recyclable, blue electronic cigarette is environment friendly

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Future challenges do exist, and there are no guaranteed solutions

In retrospect, an alternative means of digesting As, such as a microwave digestion process followed by ICP-MS (Fresquez et al., 2011)