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They're not tho. There's not really that much that can go wrong with them.
Lighter gas is easily compressed to a liquid, and the cold just makes the pressure inside it even lower, reports of people getting injured because of lighters exploding in their pockets are unheard of, and if you're really scared of them, you can always just leave them by your doorside and not take them outside. Or put them in your backpack, bike bag, if you do.
But, it's just a suggestion and stuff, so don't get angry...