Smoke inhalation occurs when a person breathes in hot air, smoke, or chemical fumes, which can cause burns or swelling in the air passages. Life-threatening carbon monoxide poisoning can occur with smoke inhalation.

The person may be restless, confused, or violent from the smoke and toxic gases inhaled. A changed mental state may be a direct effect of the toxins or may be caused by a lack of oxygen (hypoxia).

Urgent medical attention is needed for someone with symptoms of smoke inhalation. These symptoms include:

• Difficulty breathing.
• Noisy breathing.
• Wheezing.
• Hoarseness, trouble speaking, or inability to speak in full sentences.
• Coughing.
• Dark-coloured sputum.
• A change in mental state, such as restlessness, confusion, or sleepiness (lethargy).