By the way, I started another thread mentioning I had a cheap butane lighter fail under totally no-stress conditions. It had just been sitting in my backpack for a long time (years) since I rarely use the things. But I had occasion to use it and pressing the button wouldn't release any gas, so it wouldn't light. I inspected it carefully and there was nothing obviously wrong causing the problem. It had lots of fuel, no obvious clogs or corrosion, and the spark wheel worked fine. This was indoors in summer, not wet or freezing or any nonsense like that. As mentioned, I should have saved it for further diagnosis by some expert here, but I tossed it instead due to the annoyance of the moment (I was away on a trip at the time). Anyway, those lighters aren't all that reliable.