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Well here is wiki about it. http://en.wikipedia.org/wiki/Polyethylene_glycol It seems to be used both medically and in food, so it is probably ok for short term use. But really, why would you want to is you could avoid it?

I agree DubCRider. The reason that I got it was for my brother-in-law. This was his first experience with these meds. He was unable to eat anything, so I got him a tincture and the O.pen to test his tolerance to vaping. (He has had real problems with inhalation all his life.) Since he was able...

The O.pen uses polyethylene glycol to keep it liquid.