Or canned haze. In actual fact canned mineral oil, propane, and butane. A spray can that you can carry in your photo effects bag to create atmosphere in your shots.
You've seen how Hollywood film and video producers use mist, haze, and atmosphere effects to inject visual tension in a scene - every horror shoot seems to have something boiling along the ground. In many cases it's made with water on dry ice. Good for a Transylvanian feel but the vapour created is heavier than air and tends to drop fast and disperse. The actors have to bite one another quickly while the mists roil.
For a higher haze you need a different aerosol. Some have tried smoke but it can be too light, tending to drift up in spirals instead of spreading out all over the set. Unless you are prepared to torch the woods along with CALM, you may not get a wide dispersal of smoke.
The answer between the two is the pressure can you see in the heading image. One of the staff members put me onto it, expecting...