Your lungs can turn black from smoking over a lifetime. It is caused my tar sticking to the lung lobes. It varies on how much you smoke per day and how long you have been smoking, but it would require a long period of very heavy smoking.
Your lungs turning black is a long-term risk of smoking, but tobacco use also has short term and immediate risks for the respiratory system. These include constricting of the airways into the lungs, increased mucus production, coughing, and decreased physical performance. This only includes risks to the respiratory system. Tobacco use also negatively affects the brain, the cardiovascular system, the gastrointestinal system, the immune system, and the metabolic system.
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