thank you for all the good info everyone! i am guessing that the process of elimination is what i will have to try first there is really no way to know what the "dime store" version of the ecigs have in them anyway. And i am going with the menthol high cartridges as well so it may be the menthol and not the PG?? So i will order a kit and try the PG first (non menthol) and see if that is part of the problem. i had ordered the PG liquid before and had no problems with it but quit as i didnt like the ecig set up i had and at that time figured that i wouldn't like it period so had gone back to the analogs. i hope that it is just the menthol and the ecig that i have and will keep you posted on results!