So, ive been vapping 24mg for almost 2 months now. i got some 36mg juice for the tough spots, well ive been vaping the 36mg for a week now (all juices i order are 70pg/30vg) and ive got a couple sores in my mouth, im thinking the nic has burned my mouth? it doesn't seem high enough from what ive read, maybe something i ate. its only 2 spots and they are healing. with the 36 i can feel the "tingle" in my mouth and throat of the nic absorbing. maybe i should not chain-vape 36. haha sounds like a simple enough remedy. good day all and happy vapping