so i have been using 100% pg dekang menthol e juice and starting friday morning i have been having really bad back pain and mild heartburn i am stumped but i feel as though it is the 100% pg blend i am using i ordered some 50 50 high cailber ice menthol and i hope that it remedies this issue any suggestions ? can someone reccomend a good place for usa 80 pg 20 vg liquid to buy with good prices? any help would be greatly appreciated