This is week 3 of vaping. During the start of my adventures of vaping, I've purchased mixes of 40/60, 70/30, and 60/40, and 100% VG. On Thursday, I vaped 100% VG all day. The next morning, continued to vape the 100% VG juice, and then decided to try a different flavor and also switched tank and cart; but it was a 60/40 mix. After a couple hits of the mixed juice, my nose began to run and I started sneezing. It was a moment of 'ok, I now i know i'm allergic to PG". As soon as i switch the tank/cart with the 100% VG, my allergic symptoms went away.