Overall Effects

Smoking negatively affects every part of your body: 
Heart
  • Smoking triples the risk of dying from heart disease among middle-aged men and women.
  • Smoking is accountable for 81% of all chronic obstructive pulmonary disease (COPD) deaths.
  • 21% of all coronary heart disease deaths are attributable to smoking (more than 170,000 deaths each year).
Lungs
  • Is responsible for nearly 90% of lung cancer cases, (100,000 deaths each year).
  • Can cause chronic coughing, increased phlegm, emphysema and bronchitis.
Cancers
  • Deaths from lung cancer in women have exceeded breast cancer deaths.
  • Smoking is a known cause of cancer of the larynx, oral cavity and esophagus.
  • Smoking is a contributing cause of cancers of the bladder, pancreas, uterus, cervix, kidney and stomach.
Brain
  • The risk of stroke is nearly doubled by smoking.
  • Smoking is linked to a higher incidence of depression.
Bones and Skin
  • Smoking is associated with the progression of atherosclerosis and hypertension.
  • Smoking increases the risk and severity of rheumatoid arthritis.
  • Smoking reduces the elasticity in the skin, which causes more prominent skin wrinkling.
Ears, Eyes, Nose, Throat and Mouth 
  • Smoking is linked to hearing loss and vision problems, including cataracts.
  • Smoking increases yellowing of the nails and teeth.
  • Smoking is linked to gum disease and tooth loss.
Immune System 
  • Smoking creates more susceptibility to influenza, pneumonia, and colds.
  • Smoking tends to lengthen the recovery time after surgery.
Reproduction
  • Smoking may reduce fertility and lead to impotence among men.
 
Source: A Report of the Surgeon General, Atlanta, GA 2006: The Health Consequences of Involuntary Exposure to Tobacco Smoke.