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Nicotine ( C 10 H 14 N 2 ), a potent parasympathomimetic alkaloid, is the primary addictive tobacco smoke component

The number of goblet cells per 500 m of the respiratory epithelium was counted, and the heights of the columnar respiratory epithelial cells (CRECs) were measured from the basal part to the superficial part of the CREC by averaging the five points at every 100 m of the respiratory epithelium

While quitting earlier in life yields greater health benefits, quitting smoking is beneficial at any age

Symptoms include: chest tightness cough fatigue mucus or sputum that may be clear, white, green, or yellow respiratory infections shortness of breath wheezing Symptoms in later stages include: blue lips or fingernail beds, known as cyanosis swelling in the ankles, feet, or legs weight loss Breathing problems eventually make everyday tasks more difficult