Well you know, I don't know for sure whether PG is toxic. But lets get real here guys. Unless you're going to abstain from 90% of the mass marketed consumables in every category, worrying about PG in your vape is sort of like fixing a leaking faucet in a flood. Do what you like....but you're still going to get wet.
Seriously, PG is in EVERYTHING. Cosmetics, deodorant, shampoo, lotion, sunscreen, shaving cream, personal lubricants, perfume/cologne, inhalers, vaccinations, vitamins, food coloring, baking extracts, candy, etc. If you're that worried about PG, you're gonna have a bad time.