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Most contain e-liquids with varying concentrations of nicotine, mixed with propylene glycol, glycerin, or vegetable glycerin, and various flavorings

Quantification of environmental tobacco smoke contribution on outdoor particulate aliphatic and polycyclic aromatic hydrocarbons

Also there was a dude who got struck by a bit of pavement that got hit by a bullet, but that's nit picky

Opinion: mapping context and content: the BrainMap model

Check the product labels or specifications for 0% nicotine or 0mg. Also, check trusted reviews, and when buying online, ensure the seller provides a lab test/lab report or clear transparency about ingredients