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1. Why does smoking cause the lungs to darken?

The smoke itself is dust and particles. The smoke inhaled into the lungs is adsorbed by the alveoli and mucous membranes, and over time, a lot of incompletely burned carbon residue and dust are accumulated in the lungs. It's like wearing a white mask when you walk in a place where the smoke is billowing, and you should wear a black layer on the mask when you walk there. A smoker's lungs are like the chimney of a coal stove. If you light a chimney in winter, there will be pots of black slag, not to mention smoking all year round.

Cigarette lighting itself is an incomplete combustion process, and the generated smoke is actually dust-carrying air, which contains a certain amount of carbon monoxide and vaporized nicotine. Nicotine is responsible for making you addicted, carbon monoxide is responsible for sobering you up and damaging your brain, and cigarette tar is responsible for burning and creating "smoke" -- that is, dust, which turns your lungs black.

2. Can the lungs recover after quitting smoking?

Whether the lungs can return to normal after quitting smoking depends on many factors, such as the age of smoking, the amount of cigarettes smoked per day, age, and whether there is a disease in the body. Even if the objective conditions are exactly the same, there are still genetic factors that lead to the personal system.

One week after quitting smoking: Lung villi regenerate

A week after quitting smoking, the cilia in the lungs begin to regenerate, and the cilia in the lungs are used to filter impurities and prevent infection. In smokers, the bronchi begin to relax within 73 hours, and the ability to breathe increases accordingly.

Three months after quitting smoking: cilia return to normal

After the cilia return to normal, dead and damaged cells are effectively removed. At the same time, the bronchial tissue also begins to heal. This process usually takes 6-13 months.

1 year after quitting smoking: Lung function increases

Body tissue and cilia continue to recover for many years after quitting smoking. The result is a progressive increase in lung function. According to the American Lung Health Association, 10 years after quitting smoking, former smokers have half the risk of developing lung cancer than smokers.