Back in the dark ages when I used to smoke, I used Zippos. In my experience, there are only three reasons a Zippo won't work: it has no fuel, it has no flint, or it has no wick. It's like expecting your Glock to work with no firing pin or striker spring or ammo.
Most of the people posting online about Zippo problems grew up with Bics and don't know how to use the older technology.
Put me down on the list of those who think the "pocket nine" is a flawed concept. If they're small/light enough to pocket-carry, they're just so nasty to shoot (Kel-Tec PF-9, Kahrs). If they're big/heavy enough to be shootable, they're too big to pocket-carry (Beretta Nano, Glock 26). I'd love to see a pocketable single-stack .380 Glock.