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Misused Drugs, Affects the Nervous System, Damages the brain (memory loss)…

- - - - It destroys cilia**, inhibiting the cleaning of the airways, and mucus builds up - blocking the smallest bronchioles
      - A smoker’s cough is the attempt to move the mucus but it damages the epithelia resulting in scar tissue, which narrows the airways and makes breathing difficult
      - Caused by tar which stimulates goblet cells and mucus glands to enlarge, producing more mucus
      - Emphysema develops as a result of frequent infection
  - - - This puts more strain on the breathing system as breathing frequency and depth need to increase in order to get the same amount of oxygen into the blood
      - Also puts more strain on the circulatory system to pump the blood faster around the body and increases the risk of coronary heart disease and strokes