As a scientific side-note, the reason that you cant heat to 449F, (one degree below the temperature of spontaneous combustion, 450F), to vaporize ALL of your active ingredients and not produce ANY combustion has to do with what temperature really is, as physicists and chemists view it. Temperature is the AVERAGE energy of molecules in a system, and the distribution of energies at any given temperature is given by the Maxwell-Boltzmann distribution. What this means is that even at temperatures of 430F, while most tobacco molecules will not have enough energy to begin combustion, some will, and this is what causes the increasing blackening of your tobacco as you get closer to 450F. The farther you are away from that temperature, the fewer molecules will have enough energy to combust, and the less combustion products you will inhale."