There are many reasons for smoke, such as lightning strike, passengers smoking in the lavatory, overheat of the electrical system, flammable items in the cargo.
Guan Zhong instructed the soldiers to take sulfur and saltpeter and some easily combustible material, scatter it among the trees and brushwood, and then set fire to it.
They identify the packages and say, " Yeah, these do fit the description." And so, then they call Owen Egan–Chief of Combustibles–and he goes in and diffuses one of these bombs.
Fifty yards down this trail, we'll spread out, fan-wise. Now have your torches ready. At my signal, set fire to the woods. They're tinder dry; they'll burn like parchment. Are you with me?
This is the reality a teenage boy in Italy named Benedido Supino allegedly faced when he suddenly realized that he had the uncanny ability to ignite flammable items just by being in close proximity to them.