I was told in a recent Sierra Club class that lighters with piezo-electric ignition don't work well at altitude.

I couldn't get either of my lighters with piezo-electric ignition to function this past weekend at about 8000'. At the end of the day, I drove back downhill, and they performed just fine.

On the other hand, I've used a Jet Boil with with piezo-electric ignition at 10000' with no difficulty.

Anyone know what gives here?