Some say this is completely usless ANSWER IS ITS NOT.
Besides having gained popularity as “windproof” lighters, Zippo lighters are able to stay lit in harsh weather, due to the design of the windscreen and adequate rate of fuel delivery. As such, until recently they were highly popular with backpackers and within the military. Professional backpackers (operating in the wilderness) have however now turned away from the regular Zippo lighter in favor of butane lighters, heavy-duty matches, and flint rods. Many high-altitude and cold weather backpackers still prefer Zippo lighters because butane lighters are less reliable in cold weather.
A consequence of the windproofing is that it is hard to extinguish a Zippo by blowing out the flame. However, if the flame is blown from the top down, it will easily be extinguished. The proper way to extinguish the lighter is to close the top half, which starves the flame of oxygen, but unlike other lighters, this does not cut the fuel. One of the recognizable features of Zippo is the fact that it burns with a wick. Opening the top lid produces an easily recognizable clicking sound for which Zippo lighters are known, and a different, but similar click can be heard when the lighter is closed. This noise is produced by the cam, a little lever that keeps the lid closed or opened securely, which is intended to keep the lid closed when not in use.