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9 A needle trap sampler (NTS) packed with 60-80 mesh divinylbenzene (DVB) 10 adsorbent inside a 22-gauge stainless steel needle, was used as a micro sampling 11 device to extract chemical compounds in electronic cigarette (e-cigarette) aerosol. The 12 air samples were analyzed using a gas chromatography (GC)-mass spectroscopy (MS) 13 system to determine its constituents. Based on the experimental results, e-cigarette 14 smokers are exposed to high concentrations of nicotine (146±51 mg m -3 ) indoi:10.4209/aaqr.200672 fatcat:hzqhmv34x5bbhjwwlpo6hi272q