100% Propylene Glycol is basically a food additive. In its pharmaceutical grade that is used in a clearomizer for Vaping, it is used as a water retainer. It helps to keep the vapor dense and makes it look a lot like smoke. The liquid contained in a refillable clearomizer is converted into a vapor by the atomizer, but without propylene glycol this vapor would not be as dense and wouldn't guarantee a smoking experience as real and characteristic of normal tobacco smoking.No warranty on this item.
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