When you don't have room or power for a true hazer, this haze in a can might be what you need. It doesn't fill a room like a true fog machine, but does a pretty decent job for shoots of one or two people.

The hang time is quite good as long as there isn't a wind. But it's not so long that you'll be waiting around for it to clear. Plus, it's designed to be safe around smoke alarms.

For a single subject shot indoors, one can should do it. But if you're in a large area, outdoors, or need a heavy effect, then you might need multiple cans.