My doc wrinkled his nose when I told him I had been thinking of replacing regular smoking with ecigs. Not because he thinks ecigs are bad, but because...
1. He has no idea if they are good, bad, or benign in any way. Just because VG and PG are supposedly harmless to ingest into your digestive system, it does not mean that VG and PG are safe to inhale. And I agree. There is no data and the fact aht PG and VG could be harmful to your lungs (heck, maybe even more than real smoke) is a good possibility.
2. While replacing the phisical addiction/habit of smoking analogs may be a good thing in the short term, ultimately the physical habit is a very bad thing in may ways and eventually needs to be dealt with and eradicated as well.
I totally agree with him 110%. But I am trying my best to move to ecigs for the time being because my physical addiction to smoking is so strong and I would rather not deal with it right now. But I am having such a hard time moving to ecigs because, IMHO, it is nothing like smoking a cigarette. If anything, it is more like smoking a pipe, and that does nothing to satisfy my physical addiction cravings for an analog cig.