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Smoking and Lung Diseases (Carbon Monoxide (Enters bloodstream and…
Smoking and Lung Diseases
Lining of the air passages
Cilia
in trachea and bronchi are
destroyed by chemicals in smoke
Mucus is not swept away from lungs
Blocks air passages
'Smoker's cough'
Mucus is good for
bacterial growth
Increase in infections
Irritates lining of airways
Stimulates cells to
secrete more mucus
Irritation of
bronchial tree
Leads to
bronchitis
Blocks normal air flow
Difficulty breathing
Emphysema
Smoke damages walls
of the alveoli, which break
down and fuse together
Forms enlarged,
irregular air spaces
Reduces surface area
for gas exchange
Inefficient
Blood carries less oxygen
Patients are unfit
Often patients require oxygen supply
No cure
Carbon Monoxide
Enters bloodstream and interferes with ability of blood to carry oxygen
Combines with haemoglobin
Major cause of heart disease
Affects growth and development of foetus—lighter on average
Lung cancer
Over 60 of the chemicals in nicotine are known to cause cancer, KA carcinogens — Contained in the tar that collects in smokers' lungs
Cells mutate and start to divide uncontrollably, forming a tumour—can be removed if cancer cells don't spread
Lung tumours cause no pain so they are not discovered until it is too late