Inside a USB heated oil aroma dish.

This device is designed to plug into your USB port and warm water and aroma oils to liberate their chemical scents. Given the limitations of power available from a USB port it only draws about 2W of power, which is barely enough to raise the dish to body temperature.
With the low power I was expecting the circuitry to be as simple as a resistor to heat the dish and perhaps just a resistor and LED for the power indicator.
I was wrong. The circuitry inside is obscenely complicated for such a simple function and includes temperature sensing. All a bit moot really since the dish is probably never going to get hot enough even if it was just a simple resistor.
I think this may be about to get hacked.