I do hope you find it's not the PG. I kinda flipped when I noticed I was having a problem, and everybody blames their problems on PG, but then realized that I only have the difficulties with one flavor from multiple vendors, but not from others. I think it's hazelnut in some coffee juices and are not listed in the ingredients. "Secret sauce" kind of thing. The good thing is you can mix your own and figure it out by yourself. I do hope it's an inconsequential ingredient easily avoided.