Smoke is dangerous
Smoke inhalation is the primary cause of death in victims of indoor fires. Nearly 75% of home fire victims die because of the effects of the smoke rather than the fire.
Depending on the house contents, the smoke generated can be extremely toxic or irritating. For example, burning plastics often produce soot and poisonous gases like carbon monoxide and hydrogen chloride.
Modelling a fire in a tunnel
Video: Modelling a fire in a tunnel
Another danger is that smoke contains flammable compounds. With increased oxygen, these can ignite either through open flames or by their own temperature. This leads to a backdraught or flashover effect.
Smoke also obscures visibility. This makes it difficult to evacuate from a fire. Many deaths occur because people (including firefighters) become disorientated in smoke and can’t find their way out of a building.
Smoke can often cause more damage to a building than flames or the heat of the fire. Smoke will leave widespread stains and smells that are difficult to remove.