Technically, they're not ALL VG. Just mostly. Reason being is that most commercial flavorings contain PG as their thinning agent to mellow the flavor. I also use Ethyl Maltol that's been melted in PG to carry that sweetness in the vapor. A lot of crystalline additives like maltol, ehtyl maltol, menthol, etc. stay in liquid form better in PG than in other liquids.
So, flavoring and EM (Ethyl Maltol), this all comprises about 20% of the bottle. But I can assure you, everything after that, is in fact VG.
I thought you should know.