Vapourised Propylene Glycol gets inhaled at a lot of theatrical venues, no one ever makes an issue of it, including big pharma, only when people starting using it instead of a cigarette did big pharma all of a sudden start to lobby for it's regulation and ban. Vegetable Glycerine used to be used in fog machines too but it clogged up the fog machine and left a sticky residue on everything it settled on. The point is no one ever, ever complained about the dense fog you might find at a music venue, night club, concert etc and was never made an issue by any governing body. And some of those devices use oil to produce fog. Now i'm sure that these devices have been passed by the concerned government bodies as perfectly safe. So my answer to the op would be yes it is safe to vape 0% nicotine e liquid according to which ever governing body who says it's ok to inhale vapour from a fog machine at any given theatrical venue. There really is no difference between a fog machine and a handheld personal fog machine/APV. Only an idiot would argue that there is a difference.
When you consider whether the flavourings used in e liquids are safe to inhale at a certain temperature you should think about how those exact same flavour concentrates get used in the kitchen on a domestic level all over the world. There has never been an issue about whether the vapour from those concentrates could cause harm when inhaled during the cooking process, if they're burnt or not !.
If you were to consider how VG, PG and concentrated flavourings were used pre-ecig and compare that data to how these same substances are used in APV's and ecigs, you'd realise the only data you actually have is propaganda which has been conjured up by big pharma saying how bad these sunstances are. That's funny !, they were perfectly ok when weren't being used as an alternative to tobacco. When did big pharma become an expert with food concentrates and fog machines anyway ?.
Obviously Nicotine is poisonous and isn't safe to inhale and should be regulated and banned in the same way cigarettes are. And it really depends which country you are in that determines the law about that.
I am surprised the chewing gum industry hasn't lobbied for the ban on nicotine chewing gum, or vice versa. They would have a perfectly good arguement if you based it on the arguement big pharma has with the ecig industry.
Maybe the big players in the ecig industry should get together with the chewing gum industry and get nicotine chewing gum banned completely and see how they like that.
