Hydrogen cyanide and other chemicals in the smoke attack the lining of the bronchi, inflaming them and causing that chronic smoker's cough. Because the bronchi are weakened, you are more likely to get bronchial infections. Mucus secretion in your lungs is impaired, also leading to chronic coughing. Smokers are 10 times as likely to get lung cancer and emphysema as nonsmokers. The effects of smoking on the heart are devastating.
Nicotine raises blood pressure and makes the blood clot more easily.
Carbon monoxide robs the blood of oxygen and leads to the development of cholesterol deposits on the artery walls. All of these effects add up to an increased risk of heart attack. In addition, the poor circulation resulting from cholesterol deposits can cause strokes, loss of circulation in fingers and toes and impotence. The digestive system is also affected. The tar's Thin smoke can trigger cancer of the esophagus and throat.