The vapor isn't hot even when the atomizer is hot, and definitely not hot enough to hurt.
But what you're describing - I find it's happened with a few high-nic flavors I try. (Started happening when I began using the blue foam
mod on my 510 and could take these massive puffs!) Like a real angry
throat hit that kept traveling south. I backed off the deep inhaling for a while and it went away.
Or maybe you're inhaling a flavor that you're sensitive to and getting irritated?