Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Some of the most dangerous e cig flavors are cinnamon, vanilla, raspberry, pineapple, and orange. Besides flavors, e cigarette aerosol contains other dangerous chemicals like metals, formaldehyde Vaping can silently destroy your body, damaging multiple organs without you realizing it. Each puff delivers a mix of nicotine, propylene glycol, glycerin, heavy metals, and flavoring chemicals that slowly corrode your A Single Session of Vaping Can Hurt Your Lungs Liquid E Cigarettes Liquid nicotine used in e cigarettes still a danger to children despite recent decline in exposures Toxicity of humectants propylene glycol and vegetable glycerin in electronic nicotine delivery systems ScienceDirect