Polypropylene glycerol is an antifreeze. There are many anti freezes. PG is commonly used in ice cream. Only time vaping produces bad stuff is if heated to 480F or above.
It's the carrier in many medicines.
Propylene Glycol (Inactive Ingredient) - Drugs.com
It's not "an antifreeze"
As a pharmaceutical additive, propylene glycol is generally regarded as safe
It's properties make it resistant to freezing of itself, but that doesn't make it anti freeze.
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