Can't overwhelm is not how I would phrase it. Able to produce thick vapor constantly without dropping a beat whatever the duration of your draw yes. It will produce until your lungs are full, even if you have elephant lungs. But the vape is voltage regulated, not temperature regulated, this was told clearly right from the start. The knob sets the power not the temperature. You can draw too fast and introduce more cool air that just passes around the heater and lowers the temperature. Note that with other temperature regulated convection vapes that I have, if you draw too hard it's the inverse: the temperature at the bowl increases while the heater temperature stays more or less constant. The problem in both cases is that there is no flow rate sensor, so we're missing one of the most important variables in the equation. Higher flow with heater at a given temperature means more excited hot air molecules hitting the bowl and more calories transferred. So whether it's temperature regulated or not, you have to control your draw speed in order to achieve a constant temperature at the bowl. In the Zion I inhale very slowly in practice. What is important is to create a constant vacuum. Imagine you're slowly pulling a syringe piston, that's how I visualize it.