Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link The combination of propylene glycol and vegetable glycerin e cigarette aerosols induces airway inflammation and mucus hyperconcentration Scientific Reports Effects of Vaping Lung Foundation Australia Toxicity of humectants propylene glycol and vegetable glycerin in electronic nicotine delivery systems ScienceDirect
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propylene glycol vape danger Toxicity of humectants propylene glycol and vegetable glycerin in electronic nicotine delivery systems