OK..I do not smoke but EDC a zippo, it fails me far less than other lighters. I also carry ferro rods just about everywhere they will fit.yes, i am a fire nut.
This little thing would be cool if it had a larger wheel for stronger sparking, and took a larger rod-1/8" or so. O ring seals are good..BUT
WHY DOES ZIPPO NOT MAKE AN O RING SEALED LIGHTER? they could, pretty easily, it would cost more, but I'd buy four. I have written to them about this, with diagrams and the whole bit.
I use a 2-2/1/2" peice of inner tube over my lighter, a fill will last a couple of weeks. Best performance means filling 1Xweek. I feel this is a GOOD thing, as i carried a butane lighter in my pocket for months, only using it occasionally like i do the zippo, but as it needed no maintenance, i did not notice that it had leaked out of fluid. With my zippo, it needs about 1 minute a week, and it works.
Do not discount it in the wet, either. There is a reason guys in several wars liked these things. With that band around it, and with a recent fill, i have submerged my zippo in a stream for a few minutes with a butane lighter. I got both to light, but the zippo was first, to my surprise. The rubber helps with water ingress alot, and the fuel saturation displaces the water, so it does not absorb as much. A dry zippo of course will soak up water like a sponge. zippos have a larger flame, stand lit by themselves,and are easily user maintained.