Answer :
Final answer:
Long-time smoking causes lips to darken due to harmful substances like nicotine and tar in cigarettes. This discoloration is a cosmetic effect of the substances accumulating on the lips. Additionally, smoking impairs body functions and contributes to different serious health complications.
Explanation:
People's lips darken or turn black after long periods of smoking due to the presence of nicotine and other harmful substances in cigarettes. When a person smokes, these chemicals are inhaled and can deposit on the surface of the lips, causing a discoloration. Specifically, tar, a sticky substance present in cigarette smoke, can settle on the lips and cause them to darken.
Besides giving the lips a blackish tint, smoking can affect the mouth's normal functioning and the body's overall health. The cilia, tiny hair-like structures that help move particles out of the body, are damaged or paralyzed by substances in cigarette smoke, including tar. This disruption leads to an increase in mucus production and a persistent cough, as the lungs attempt to eliminate particulate matter.
Moreover, habitual smoking exposes the body to various dangers such as lung cancer, heart disease, emphysema, respiratory ailments, and complications during pregnancy, as per the Surgeon General's warning. Second-hand smoke is also detrimental and contains toxic and carcinogenic compounds harmful to human health.
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