I noticed that TFA's blueberry candy seems to be mostly triacetin...or rather, uses it as a flavor carrier.
I just ordered it, so I am also interested. But there's no mention of what impact it has on flavor. On my first google of it I got this:
http://www.ncbi.nlm.nih.gov/pubmed/14555416
which explains that triacetin is "GRAS" (generally recognized as safe - an FDA classification designating something safe-ish for ingestion). We know how little that means for vaping safety, though, since GRAS substances may have been tested in a number of different (usually pretty limited) ways, but never, as far as I know, for long term inhalation effects. Not that you asked, CrazyChef...lol. I'm just being chatty.