Has there been a discussion on the forum of the similarities between VAPE pipes and model train smoke units. The primary components used as vape fluid is Propylene Glycol and Glycerin the same major components of smoke fluid. Vape pipes generally operate between 212f and 480f give or take a degree. As the temp increases above 400f the percent of potential carcinogens rises. As fluid boils away in our smoke units the temperature of the heating element goes up. I think this is good justification for a thermistor in the heater circuit to limit peak temps. Surly we have a chemist on the forum who might shed some light and clear the smoke here. 
I have a very poor tolerance for the smoke our locos produce and about the only time I turn it on is when installing testing or repairing smoke units. j
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