A certain biplane formation team with outstanding passengers was sponsored for a while by a cosmetics company. The airshow smoke was produced by injecting baby oil rather than diesel into the exhaust, which enveloped the crowd at one well known event with copious amounts of sweetly scented instant fog as the birds on biplanes cavorted overhead. I don't know about anyone else but I had the threepenny bits big time the next day and I blame that bloody smoke! Just like castor oil...