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The presence of carbonyl compounds, such as formaldehyde, in e-cigarette aerosols results from the heated degradation of e-liquid components (e.g., propylene glycol and glycerin) and depends on device features (e.g., closed vs open systems) and device settings (e.g., heating temperature and voltage) and result in higher HPHC levels in e-cigarette aerosols from some devices [11, 56,57,58,59]

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Notably, the free water and adsorption water were contained in semi-bound water mentioned herein