Lung Cancer

• Tobacco contains carcinogens, a known cancer causing substance. Inhalation of tobacco smoke into the lungs can greatly increase the likelihood of lung cancer. According to the American Lung Association, smoking is the cause for 90 percent of all lung cancer diagnoses.
  
  

Emphysema

• The toxins in tobacco smoke can damage your bronchial tubes, making breathing difficult and infections likely. According to quitsmoking.com, smokers are 10 times more likely to become diagnosed with emphysema than non-smokers.
  
  

Heart Disease

• Smoking can increase blood pressure and reduce circulation, opening the door for heart disease and other cardiac related illnesses.
  
  

Impotence

• Several notable studies, including one by Tulane University, have linked smoking with male impotence and erectile dysfunction. Although the direct cause is not known, smoking does statistically increase the likelihood of these ailments.
  
  

Premature Births

• According to a study conducted by the U.S. Department of Health and Human services, smoking accounts for up to 30 percent of premature births and 10 percent of all infant deaths.