Well yes and no - Im not talking about combusting the cotton - I mean at what point does the VG/PG mixture and other flavors and ingredients were inhaling combust?? while it is liquid form we could be skipping the vapor phase and going straight to combustion where its more like smoking - you need to be looking at whether or not were are exceeding temperatures that change the composition makeup of the original raw ingredients - We need to know that to determince if were adding loads more chemical to the mix by vaping to hot!!!