Since I've been vaping, I've got multiple questions or comments about the safety of PG based liquids. I've gotten statements of "Oh your just smoking antifreeze" which really makes me laugh. Propylene glycol is used in TONS of everyday items.
First off on Wiki, under "Applications": Propylene glycol - Wikipedia, the free encyclopedia
"As a non-toxic antifreeze for winterizing drinking water systems, and in applications where the used antifreeze eventually will be drained into the soil, water, or a septic system"
"As a moisturizer in medicines, cosmetics, food, toothpaste, shampoo, mouth wash, hair care and tobacco products
"In hand sanitizers, antibacterial lotions, and saline solutions"
"As a solvent for food colors and flavorings"
Video document about this topic: VapeTalk PG-Propylene Glycol Safety - YouTube
I am sure everyone has there theory's about the topic.
Another short video on this topic: What is Propylene Glycol - YouTube
If someone is poorly informed about it being "antifreeze", the deadly chemical in antifreeze is "Ethylene glycol" (Once again, Wiki: Antifreeze - Wikipedia, the free encyclopedia).
The main point of this post is to help inform people of what they are using, versus what some people tend to think (usually non-vapers).