Cigarette smoke may disappear within seconds, but its effects on the lungs can last far longer. Smoking exposes the body to thousands of chemicals, including many known carcinogens, while particles and tar can irritate airways, increase mucus and impair the tiny cilia that help clear the lungs. According to experts, carbon monoxide may remain in the blood for 24–36 hours, while nicotine and its metabolites can persist for several days. Lung recovery after quitting is gradual, with cilia function potentially taking months to improve. The good news is that quitting allows the lungs and cardiovascular system to begin recovering, with health benefits continuing over months and years. Even light smoking can cause measurable harm, making quitting the most effective way to protect lung health.
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