In various Hollywood movies, live theater productions, and even music videos, fog machines are a staple for creating a particular hazy, alluring, or chilling atmosphere. To that end, a fog machine is capable of emitting a vapor that looks similar to fog or perhaps even smoke. Depending on the type of machine, they can be fueled by water and glycol or dry ice. It simply depends on the desired effect from the use of the machine.
While fog machines used to be used exclusively by professionals, they have been greatly reduced in price since the mid 2000s. This means the use of fog machines in the private sector has been greatly increased. As such, they are common now in residential haunted houses or other various Halloween displays. On the professional front, firefighters also use fog machines to train. A fog machine, after all, accurately simulates the poor visibility that will be confronted in some burning buildings.