My throat would just get irritated every time I would take a vape on it. It would feel like my throat was swelling (it sounds a lot worse than it was, it felt like minor inflammation). The weirdest one was every puff I would take the back side of my bottom front teeth would hurt like I put something really cold on them. This was just my experience vaping 100% PG fruit punch flavor. Going to 50/50 PG/VG has taken all of those symptoms away, Fruit and fruit punch vapes are still my favorite.
Thanks for answering my question. I was just curious. Thus far I haven't had any side effects. I just feel a whole lot better than when I was smoking cigarettes!