Propylene Glycol is used as a moistener for pipe tobacco and other tobacco products such as dip and pouches. It is used as a base for pharmaceuticals for oral, injected, or topical formulations. It's used in most hand soaps, shampoo, body wash, hand sanitizers, and moisturizers. It's used as a solvent for food colorings and flavoring. It's used to regulate humidity in cigar humidors. It is used in tattoo ink. Not to mention it is used as the main liquid in any and every fog machine, even the fog machines used in training for firefighters. Propylene Glycol is used in almost any food or drink that you buy that has food coloring in it. It is also used as a moisturizer in dog food.
When you go to the hospital for respiratory issues, they might treat you with steroids in a vapor form--can you guess what the base is for that vapor?
We basically drink, eat, breath, and use PG in every day things, and yes, it was already in most of your cigarettes.
If these douchebags want to start trying to ban e cigs because of PG, they need to first admit that if they ban electronic cigarettes for that reason, then every other ingestible PG product has to also be banned.
Edit: I know I brought the dead back to life with a post on this ancient thread, but I wanted to add some information. Sorry if I come across as a jerk. Everything in life has a downside. PG and VG are both viable for usage as bases for nicotine vapor delivery.