When you see these youtube vapers always cough heavily from vaping herb, they reached combustion temperature, which produces the most itchy smoke i could ever experience. You can also tell by the density and volume of the exhaled fumes if max. vaping temp was exceeded.
I'm more of a Delta 8/Delta 10 guy until Delta 9 is legalized in Texas - never had a thing for vaping nicotine after quitting cigarettes a couple decades back - and it always blew my mind how these kids are producing absolutely obscene amounts of vapor from these devices, when as a daily user, I'm lucky to set the temperature over 3.0V, and that suits me just fine for producing a satisfactory hit. Sometimes I even take it lower to 2.5V, but find anything lower than that starts to be problematic for adequately vaporizing.
¯\_(ツ)_/¯