From my limited experience with smoke in cars, sadly they often turn to fire. Because, you know, like the first humans that did create fire, very often when a f

From my limited experience with smoke in cars, sadly they often turn to fire. Because, you know, like the first humans that did create fire, very often when a fire starts there's smoke... I've seen a Saab in which the ashtray started to smoke and then before we could pull out (on the highway) the dashboard had flames and started to melt. And I've seen a very nice and shiny Porsche 911 Carrera model 964 whose alternator belt did broke and then started "burning" on the engine. We smelled it and then we could see smoke. By the time we opened the engine trunk (with our fire extinguisher in hand) it was on fire. Funnily enough the repair were under warranty and there wasn't much to change (the trunk needed to be repaint and one or two pieces changed). When there is unexpected smoke on a plane it is a safety issue. Seen that a Boeing supplier's factory went up in flames due to a battery that took fire, I'm not exactly sure there's "no doubt Boeing know that even if the batteries smoke and fail they won't be a threat to safety". Same for the 16 hybrid sport cars that burst into flames on that parking lot due to batteries shorting. I think that: "There's no smoke without fire" may be the sentence you're after ; )