Dangers of Pure Oxygen: Breathing 100% pure oxygen for an extended period, more than 16 hours, can lead to irreversible lung damage, retinal damage, and eventual death.

Lung Defense Mechanisms: Lungs have built-in defense mechanisms to protect against pollution and contamination. Specialized cells produce mucus to trap dust and dirt particles.

Continuous Breathing: The average person breathes approximately 13 pints of air per minute, and breathing is a continuous, essential process in our lives.