It may be worse than you realize!
Effects of Smoking on the Lungs
Smoking may cause lung cancer, which is the most common cancer caused by smoked. Smoking causes the lungs to become black and charred. The lungs may overproduce mucus due to the irritation of the lungs cause by smoke. Chronic Bronchitis, more commonly 'Smoker's Cough,' is caused by the extra mucus that is produced. Smoking also breaks down the structure of the lungs; the elastic walls of the small airways are broken down.
Effects of Smoking on Other Systems
Smoking affects the integumentary system by constricting the blood vessels at the top layers of the skin. Smoking also accelerates the aging process by creating wrinkles in the skin earlier in life. Smoking discourages the production of new and healthy cells, meaning that the cells (especially in the nails and hair) will become affected whether they change color or start to produce an odor.