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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]

Most marijuana vape users know the conduction process

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It loses this afterwards, either because of the pain or because its mouth is simply too damaged to make one

It is important to note that this was a cross-sectional study, therefore the findings of associations between a range of variables and smoking does not indicate a causal relationship