Lungs

• Smoking cigarettes damages the lungs. Smokers are at a higher risk of suffering from lung-related sicknesses like pneumonia, according to the National Cancer Institute. Smoking is also the number one cause of chronic obstructive pulmonary disease, or COPD. There are two types of COPD: Chronic bronchitis and emphysema. Symptoms of COPD may include wheezing, coughing with excessive mucus and shortness of breath, notes the National Cancer Institute. COPD has no cure, although the symptoms may be treated with medication. Smoking also leads to lung cancer.
  
  

Heart

• Smoking increases blood pressure and may lead to a number of heart conditions including atherosclerosis, or the narrowing of the arteries due to deposits, according to the American Heart Association. Smoking may lead to heart attack and increases the risk of stroke.
  
  

Reproductive System and Pregnancy

• Smoking reduces fertility for both men and women, reducing their chances of becoming pregnant. Smoking may also lead to erectile dysfunction in men.
  
  Women who smoke while pregnant expose their fetus to the dangerous chemicals in cigarettes. Additionally, smoking limits the amount of oxygen the baby receives. Smoking during pregnancy may lead to miscarriage, low birth weight, still birth and a number of birth defects, according to the March of Dimes.
  
  

Vision and Oral Health

• Smoking increases the risk for cataracts. Cataracts cause the lens of the eye to become clouded, reducing vision. Surgery is often required to remove cataracts.
  
  Smoking also effects oral health. Smokers face a higher risk of gum disease, and are more likely to lose teeth due to decay. Smoking may also lead to cancer of the mouth.
  
  

Appearance

• Smoking reduces the amount of oxygen that your skin receives, leading to dull, sagging skin. In addition, smoking increases wrinkling of the skin, primarily around the mouth and eyes. Age spots and other signs of premature aging may also occur as a result of smoking cigarettes. According to WebMD, smoking also leads to hair loss in both men and women. Cigarette smoking causes a yellowish brown discoloration on teeth, and causes bad breath.