This is an interesting photo showing trails of a mist, unlike cigarette smoke, making its way around the girls on the swings. The image of a possible entity (or ghost?) was recorded by camera in the UK, recently:
"Lauren and Bailey in Kenilworth Park, Warwickshire where an ancient cemetery lies. - Chloe"
When reviewing photos of mists for posting, we prefer to share vapor trails like this example. Cigarette smoke often appears drastically different, swirly; and a mist trail, such as this one, is not likely to be created by the natural environment (such as fog produced from the difference in ground-air temperature).