Lung Disease
Smoking accounts for about 80-90% of all chronic obstructive pulmonary disease (emphysema, chronic mucus secretion, chronic air flow blocks) Smoking is involved in 85% of all lung cancer deaths!(which is incurable) An individual with chronic bronchitis (which is caused by smoking) is more likely to get a bacterial infection if he/she is a smoker. A smoker gets more nose and throat inflammations, respiratory infections, and chronic bronchitis.

Heart Disease
Cigarette smoking accounts for 30% of all heart disease deaths. The carbon monoxide in the cigarette smoke increases the amount of cholesterol clogging the arteries. Smoking causes a stiffness in the walls of the arteries which is harmful to the artery and increases the risk for the artery to rupture. The nicotine in cigarettes can raise your blood pressure, heart rate, and the oxygen demand for muscles, especially the heart (the heart is a muscle). A coronary spasm may occur during smoking, which may lead to chest pain, and a heart attack Blood clots more readily in smokers than in nonsmokers.

Cancers
Cigarette Smoking is the major cause of cancer of the lips, tongue, salivary glands, mouth, larynx, esophagus, and middle and lower pharynx. The development of stomach cancer can be directly associated with smoking. Smoking is known to cause bladder cancer. Quitting smoking will not result in a significant reduction in the risk of getting bladder cancer. Cigarette smoking has been linked to cancers of the renal pelvis (part of the kidney), uterine cervix, and pancreas. A strong association exists between smoking and leukemia.

Hormonal Problems
Women smokers enter menopause an average of 5 years earlier than nonsmokers. Smoking and nicotine can alter a number of hormones involved in the reproduction function. Women who smoke are at an increased risk of osteoporosis. In male smokers, the mobility of their sperm is reduced.