Reactions to particles in smoke.

Smoke is a mixture of particles and gaseous chemicals of varying physical and chemical properties. When inhaled these produce the characteristic features of smoke-inhalational injury. Although heat is produced in fires it is the chemical agents which cause the damage to the airways and the lungs. Mortality and morbidity are closely related to pulmonary injury and thus to the particulate and chemical nature of smoke. Moreover, there seems to be a potentiating effect, in that the particles worsen the toxicity of the chemicals present.