There are mainly land, water and wine, and things that react chemically and emit white smoke.

This kind of calcium carbide rod, CaC2, reacts with water to produce acetylene gas. With a lot of heat generated, the water changes from liquid to gas, and it is cooled into small water droplets in the air again, which is the white fog you see. These things are deceptive and unreliable. I advise you to stay away from such people.