A needle trap sampler (NTS) packed with 60-80 mesh divinylbenzene (DVB) adsorbent inside a 22-gauge stainless steel needle, was used as a micro sampling device to extract chemical compounds in electronic cigarette (e-cigarette) aerosol. The air samples were analyzed using a gas chromatography (GC)-mass spectroscopy (MS) system to determine its constituents. Based on the experimental results, e-cigarette smokers are exposed to high concentrations of nicotine (146±51 mg m -3 ) in a long session. If the e-cigarette liquid leaks through the filter of the cartridge of an ecigarette, the user is exposed to nicotine of very high concentration of 914 mg m -3 .Other main compounds in the smoke of e-cigarettes are vegetable glycerin, propylene glycol and triacetin. The concentration of nicotine in the secondhand aerosol is lower than 1 mg/m 3 (around 0.43-1.74 mg m -3 ).
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