Traces of vanadium in substantial-temperature combustion products and solutions form droplets of molten vanadates. These attack the passivation layers on metals and trigger substantial temperature corrosion, and that is a priority specifically for internal combustion engines. Molten sulfate and lead particulates also have this kind of outcome. 1600 – https://broadfar.com/heated-tobacco-shaping-a-safer-sustainable-smoking-future/