Very neat, im not sure if ive ever combusted so i guess im not really sure what it looks like. Its always in the back of my mind tho. I hydro-vape everything so hopefully what ever does combust is filterd
From all reports I've read, you'll know if you combusted. Smoke is thicker than vapor, so that is one indicator.
The other big one is seeing an ember. If your product starts glowing, turns black and eventually into white ash, you've combusted.
I've only combusted twice with my Dynavap, when I forgot to wait for the cooldown click, but there was a significant difference in flavour and texture. You really can't miss the difference. I haven't come close with my EQ or ArGo.
I would venture that if you don't 'know' if you've combusted, you probably haven't.
You normally have to thoroughly clean EVERYTHING after you combust to get rid of the flavour.