With vaping mods, not e-cigs, can burning accidentally occur within the unit instead of vaporizing? I have a basic Kanger EVOD setup, and, before upgrading the tanks to Protank 2 Minis, I noticed that when the coil was getting really spent - particularly the coil, I'd taste a burnt taste, along with PLUMES of something which I think was more smoke than vapor... I also noticed the fluid in the tank would turn to dark brown. And then I also noticed that when this was going on, sometimes the adapter part between the battery and the tank itself (where the coil screws in), would get burning hot to the touch. I have friends that vape other sorts of non-nicotine products, and they frequently say that if the units are cheap or not used correctly, that burning occurs instead of vaping. Is this true for the kinds of units and fluids we use? Also, I noticed that what I described above doesn't ever occur anymore with the new Protanks ... It kept happening with the cheap, plastic tanks that came with the original EVOD kit. So yeah, anyway, I was just interested for the sake of personal edification... Was I witnessing burning? I'm not dealing with it anymore now that I've got better equipment, but just wanted to know for the sake of knowing and getting knowledgeable about vaporizing.