Why do inhalation of CO can cause death to a person?

Inhalation of carbon monoxide (CO) can cause death because CO binds to hemoglobin in red blood cells with a much higher affinity than oxygen, forming carboxyhemoglobin. This reduces the blood's ability to carry oxygen, leading to tissue hypoxia and organ failure. Additionally, CO can disrupt cellular respiration, further impairing the body's ability to utilize oxygen. Symptoms of CO poisoning can progress rapidly, making it a life-threatening condition.