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When you flick a lighter and every flick it generates shower of sparks that consist of hundreds or thousands particles and only a small
portion of it have been use to ignite a flame, the remaining
particles will hover in the air.
Thus, if you were in the air-conditioned rooms, most likely you would inhale the remaining of these fine particles into your lung called Ferro-cerium which could be dangerous to your health in long run. The side effects can cause internal organ injury or death due to accumulation of excessive inhalation of flint powder and for more info on how it affect your health, kindly refer to the link http://www.chemicaldictionary.org/dic/F/Ferrocerium_1080.html