That's such a great story. It's amazing how vaping has transformed us, and I love hearing peoples' success stories.
I don't have time to get real lengthy, but the doc should be informed that there is hard evidence regarding the absorption rate of nicotine via e-fags is far less than flaming ones. As such, (s)he shouldn't be discussing dose since there is no objective meter as of yet. Further more, the FDA dropped the requirement by cig manufacturers regarding the nicotine content since the methodology was inconsistent. While unregulated, e-fluids are likely to be more consistent, and as such provide accurate medical data since any experiment needs the proper controls, and by removing over 4000 compounds from the equation, it should provide a more accurate picture.
It should be noted CLEARLY that withdraw systems have been observed, but more objective research is pending (Virginia and Chicago). Until that time, dose should be observed and recorded, not interfered with since this is an experiment, you're the object, and introducing observer bias is counter indicated.