nothing like a self diagnosis on the interwebz.....OP go see a doc. Furthermore, continuing to smoke cigs isn't going to give you any dramatic change in health due to vaping. Sorry to be the bad news brigade but seriously...Go see a doctor because on these forums and any forum, everyone "thinks" they know everything and you can be severely misled.
Just as even good doctors can sometimes steer a patient down the wrong path. Speaking from personal experience, anyway.
And speaking of which.. not for nothing, but I don't know a lot of doctors who vape. They may know the basics of vaping, but do you really think they're going to suggest the patient try different brands & flavors & nic levels of e-juice? Perhaps to cut it with some VG from Wal-Mart?
At best he'll say to quit smoking, quit vaping.. Still having a hard time? Here's a prescription for Zyban...
Who better to ask than people who have already gone down this road?
And I don't recall every post, but there was at least one person (me) who mentioned that it might not even be related to vaping.