So let’s say that I’m travelling the solar system and I decide to stop at Jupiter. Since I can’t actually land on Jupiter (even if there’s a “solid” core down there formed by the pressure) I just descend to a depth where the pressure is roughly one atmosphere. And since I happen to be a niccotine addict I decide that this is the perfect place to light up a cigarette. Forgetting I’m in a spacesuit a flip open my butane lighter and there’s a spark.
My question is what happens then. Is there an explosion? How large of one? I don’t think the reaction would spread to consume the entire planet but if it did what would Jupiter be like afterward? If there is a major reaction, does this occur any time there’s enough heat or does there need to be some other factor? Should gas giants be considdered entirely non-smoking sections?