How are Non Combusted Cigarettes, Sometimes Called Heat Not Burn Products, Different from E Cigarettes and Cigarettes? FDA IQOS, Philip Morris's new heat not burn tobacco device, explained Vox How are Non Combusted Cigarettes, Sometimes Called Heat Not Burn Products, Different from E Cigarettes and Cigarettes? FDA Vegetable glycerin and propylene glycol and the burning of dry coils. How likely is your e cigarette to explode?