I just want to make sure I answer your question. I can't give you a comprehensive answer on the pharmacology of everything that could possibly be mixed in it.
Propylene glycol is routinely available. You probably used it in your shampoo today. We actually use it as a suspension for the delivery of drugs such as diazepam—Valium—and things like that. It's an organic molecule that is very quickly broken down in the cells to lactic acid and pyruvic acid, which are used by your liver and made back into glucose. It has been studied for over 70 years in inhalation, injectable, and oral forms, and there have been no fatalities or adverse outcomes, aside from irritation, associated with it.
The lung realistically responds in two ways to chemicals. They can cause cancer or they can basically cause the equivalent of emphysema. Bronchitis is reversible.
No evidence has ever been presented, either molecular or clinical, that the combustion, the vaporized products of propylene glycol, can cause either, no matter how long....
I agree with Dr. Sweanor that we need to create a framework to understand how, if the misuse or the lateral consequences of this technology are occurring, we address those, but I think that essentially trying to throw out the immense benefit of this potential and manageable harm that might be caused would be a disservice to people today.
