Hello and welcome to Healthcare Magic. Thanks for your query.
I appreciate your efforts to cut down on your smoking
. The symptoms which you have mentioned, that is soreness and pain in the right side of the chest and armpit are unlikely to be due to the e-cigarrettes.
It is quite likely that you are having an underlying medical problem in the chest which is causing you these symptoms. Lung diseases or cardiac problems can often present with such symptoms. So, I would advise you to see a doctor as early as possible to have a physical examination and further investigations (like a chest X-ray, ECG, etc), so that the cause of your symptoms can be determined.
Wish you all the best.
Dr. Jonas Sundarakumar