So do smoke grenades go off on their own?

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Honest to god I’m not sure what happened, I’ve been playing the game for 200 some hours now and never encountered something like this. I was looting a military camp on offical, going tent to tent, it was clear a player had been through not long before me, but other than that I seemed to be alone(no zombie corpses, zombies were calm, no other player signs). I was looting a tent When I suddenly heard a sizzling noise, sounded like rain at first but when I turned around there was white smoke goi...