I have a Joye 510, have read these forums thoroughly, and still am unsure as to why I keep getting severe sore throats from vaping. I am a pack a day smoker, and as soon as I received my 510, used it almost exclusively over my "analogs." The real problem arose after a night out to the bars and vaping much more than usual. When I woke up, I had pain when swallowing, and it felt as if my throat was swollen and tight. After a few days, the pain was gone. I have researched this, and I do not think I am allergic to the "PG" juice, since I only had problems after several hours of constant vaping while drinking. No, I have not tried the "VG" juice yet, but I am not convinced that will solve this problem. Right now, I believe it may be the quality of the juice I am using, since I ordered it all from the StrictlyEjuice website. Maybe people say they use cheap ingredients, and that is why they can sell so cheap. My next order of ejuice will probably come from somewhere like Mrs T's Bakery, as they are supposed to have premium products. If anyone out there can give me any kind of suggestions, help, words of wisdom, or criticism, I would be greatly appreciated!