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of 95% propylene glycol and glycerin, and the remaining 5% being flavorings, nicotine, and other additives. There are e-liquids sold without propylene glycol, nicotine, or flavors. The flavorings may be natural, artificial, or organic. Over 80 chemicals such as formaldehyde and metallic nanoparticles have been found in the e-liquid. There are many e-liquids manufacturers in the US and worldwide, and more than 15,500 flavors existed in 2018. Under the US Food and Drug Administration

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