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[Stockbild] Cigarette lighter. Simulated X-ray of a cigarette lighter. The hinged lid of the lighter is slightly open. The main body of the lighter contains a canister of lighter fuel. A wick draws the fluid up the nozzle (centre), where it vaporizes. The gas is ignited by a spark created by rubbing the wheel (centre right) on a flint. The protective grille around the nozzle helps the lighter to stay alight even in windy conditions. (KEYSTONE/SCIENCE PHOTO LIBRARY/MARK SYKES) === ===