Plain and simple, oxygen in it's liquid form is toxic, as is nitrogen. You can't always reduce things to "plain and simple".

I know this:

I havent smoked a cigarette since November. I was a half-a-pack a day smoker.
I gradually tapered off to the point that I am vaping less than 2 ml a day, of 4.5 mg/ml.
My car doesn't smell.
My apartment doesn't smell, and I don't have to go outside.
I have spent far less than on cigarettes.
I have what…