Hummm half a douzen of one and six of the other!!! Who knows at this point. I used to say VG without a doubt, this seemed to be supported by lab reports such as the totally wicked one. But now come Satire's findings as posted in the other thread, and Satire is someone who does his research! Now I am vaping a little of both to be honest. I don't seem to be allergic to either or having any real notable side effects so my body isn't steering me away or toward either. Its hard to make an educated guess, or logical guess. I've been more attentive to the contents of products of late and I'm using both VG and PG daily in my skin care, hair care and, to a certain extent, diet. However, inhaling the stuff is a whole new ball game and, frankly, its seem to be the great unknown.