I enjoy the occasional retrohale, but I’m curious what exactly separates it from “light” inhaling on a technical level? I assume retrohaling involves some certain amount of inhalation proper?
That's a French inhale. Retrohale is out through the nose.Retrohale, let smoke slowly out of your mouth and draw it into your nose.
Nicotine is better absorbed via mucous membranes (lining of your mouth, nasal cavities and sinuses) than if swallowed.
Hence when using nicotine gum, the instruction is to chew for some seconds, then park the gum between your teeth and cheek.
And NOT to swallow.
So whether you retrohale or inhale, you will be absorbing nicotine