I am a newbie to this site and to vaping, but as a Dental Hygiene student, I would encourage you to seek out your dentist (as soon as possible) while the symptoms are still present in your mouth. It may be nothing, but your dental professional will be the best person to tell you if it's something to worry about. As someone who has smoked for as long as you have, you are at risk for oral cancer. Truthfully, we all are. So it's important to have any oral abnormalities looked at.
I am very interested in vaping as a mechanism to quit smoking cigs, but oral complications are something I am looking at as well. Obviously, I smoke... which is bad... but I don't want to substitute one bad habit for another bad habit. I haven't thoroughly explored this site, so this may be something that has already been covered at length. Just thought I would give my 2 cents.