I really don't like any argument that states "it's got to be better than smoking, right?"
That's not a good argument in any way, because we simply do not know whether it is or it isn't.
We have studies that show that inhaling aerosol PG is very likely safe. But the other ingredients? We just don't know. There is the potential that it's far more dangerous than smoking, although I consider that unlikely, due to the (admittedly smallish number of) studies that have been done on the chemical makeup of vapor.
I initially though "all organic, using tobacco leaves" would be a great way to flavor a nic juice. But I have my concerns, because tobacco by itself is carcinogenic, and I've personally changed my mind on using those juices.
We're just not deep enough, time-wise, into vaping as a NRT to know all the facts.