Many things might look like smoke to a layperson, but aren't, like contrails or [wingtip vortices](https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hires

Many things might look like smoke to a layperson, but aren't, like contrails or [wingtip vortices](https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hires/2018/1-researchexam.jpg https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hire...).