Traces of vanadium in high-temperature combustion items form droplets of molten vanadates. These attack the passivation layers on metals and trigger large temperature corrosion, that is a concern especially for inner combustion engines. Molten sulfate and direct particulates even have such impact. Notice: Tobacco products that satisfy the statutory https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/