Maybe not an allergy per-say, but at least a negative reaction to PG? Used to use 80/20 and now it kills my throat after a few drags if I try anything less than 60/40 or 50/50. Don't think it's flavorings as I haven't changed my rotation lately either. Hopefully it's something else causing my throat to be sensitive, maybe allergies, but I'm not dealing with any other symptoms, so it's a mystery to me. Hoping someone else might have been through the same thing and can comment as to whether it got better over time or not. Just grabbed a bottle of 70% VG 30% H2O to try, will see if that makes any kind of a difference at all when I get it..