I live in east Pennsylvania - "the coal regions." I can say for a fact if you're caught in a coal mine with anything that makes a spark, be it matches, lighter, or anything else, you will get your arse beaten to a pulp. Too many people have died because some fool decided to have a cigarette off in a hidden corner of the mine, only to find a methane pocket. Look at any professional mine and you'll see a line of cigarette packs and lighters sitting just outside the door to the elevator that takes the miner's down to the mine. If you're caught with one, you'll suffer what's know in the service as a "blanket party." There's a difference between a mine and a cave!