the cold heat soldering gun operates with a graphite or athalite tip it is a proprietary material but me and my brother have been kicking around the idea of taking one apart and seeing how it would work because that material heats and cools so fast that it would lend itself to e cigarettes nicely.I was also thinking that maybe the whole idea of a coil might be the problem, why not just some kind of very small heating pot? I'm not sure how this would work or if it could be brought up to temp. But it is a thought.