Also, though it took me a while to get used to it, I really don't inhale vape like I did cigarettes... just take it into the mouth, maybe up through the nose for fun...and exhale. Supposedly, though it's counter-intuitive to a smoker, the nicotine is absorbed better that way and it saves some stress on the throat and lungs.
This is exactly what I was going to suggest; if I try vaping as if I'm smoking, hard fast inhale to the lungs, a) not nearly as much nicotine is absorbed, and b) it can irritate, while also not delivering a hell of a lot of flavor -- just kind of a "well, that was nothing" kind of feeling, along with the irritated throat.
If I take a long, slow pull, then very slowly inhale just to let it go up the back of the throat/nose, then let it gently roll out the nose, it gives MUCH more flavor, MUCH more nicotine, a good deal more of a "cloud," and an all-around MUCH better experience -- but it's not terribly easy to learn if you're used to just that fast inhale of smoking, it takes some thought and attention.
Hope that might help,
Andria
PS: Forgot to add -- the reason cigarette smoke doesn't burn is because of additives they put in the tobacco that actually anesthetize the tissues of the mouth, throat, sinuses, and lungs. Those additives are not in e-juice, which makes it more important to inhale it "just so*.