Traces of vanadium in high-temperature combustion items kind droplets of molten vanadates. These attack the passivation layers on metals and cause large temperature corrosion, that is a priority especially for inside combustion engines. Molten sulfate and guide particulates also have this sort of influence. Note: Tobacco products which meet https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/