Well that's what im looking into as one most "vape juice" is typically a combo of Vegetable Glycerin and Propylene Glycol in 50/50, 70/30, and some straight VG mixes, so if we can extract and make our own concentrates using VG it would make sense that it may be the avenue to go down for home concentrate juice production.
The issue it seems with VG is that with it being such a weak solvent, unless constantly agitated for decent amount of time or by the addition of heat to that as well that a interface barrier layer is formed where the initial aggressive of the VG as a solvent on untouched resin glands is reduced as you have a reduced solvent acting on that resin unless it can be exposed to a more fresh or pure solvent than one that may already be concentrated, thus the agitation/mixing and heat.
At first with what ive been reading most of the mixes for "liquefying" wax and the such typically have peg400 in it which isn't necessarily good for you according to most reports on the subject matter, and rightly fully so. The other option is to use terepene based liquidfier for it, but those terepenes are just another solvent when you get down to it that is more aggressive than VG, PG, PEG400 and the likes from my understanding but i haven't actually looked up and compared the actual aggressiveness of them in comparison, but from my general knowledge in related chemical fields it would make sense that they are such as an example of one terepene Limonene is typically used as a degreaser aka "citrus degreaser"
And right now there is so little info on the subject or at least hard to find as everyone want to keep what they know a secret and its relatively new as well
also as far as the exploding vape, its the litium batteries exploding thats the issue, straight up electrical burns combined with heat and shrapnel at times, but pretty mush all cases are due to improper handing of the batteries.