My first device was a 510 and I never experienced a sore throat with the atomizers or cartomizers. I just bought a kr808 and the throat hit is very harsh compared to the 510. My throat actually feels like it has been burned. Is the KR808 a higher voltage? I have been getting my juice for the 510 at Liquid Express with no problems. My recent juice (for the 808) came from V4L. I don't know if it is the juice or the device. Anyone have this problem with the 808?