The seen particulate issue in such smokes is mostly composed of carbon (soot). Other particulates can be composed of drops of condensed tar, or reliable particles of ash. The presence of metals from the gasoline yields particles of metal oxides. Particles of inorganic salts may be formed, e.g. ammonium https://manuelvokct.wikihearsay.com/3282732/the_smart_trick_of_cigarettes_that_nobody_is_discussing