Both the built-in control screen and the app show the real-time levels of airborne particulates in three size classes (1, 2.5, and 10 microns, roughly corresponding to smoke, dust, and pollen)
How Long Does 5,000 Puffs Last
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E-cigarettes work by heating a liquid that contains nicotine, propylene glycol and vegetable glycerin into an aerosol that can be inhaled by the user