This is what the contents are of Vermont Vapor's menthol:
Contents: Glycerine, propylene glycol, alcohol, menthol -
nicotine and citric acid may also be present, to varying degrees,
depending on the chosen formulation.
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I agree, PG gives me stomach issues as well....in addition to my fears of buying anything made in China...lol. I just ordered Ecopure menthol and will see how that is.