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Smoking addiction is harmful because it ...

Smoking addiction is harmful because it produces polycyclic aromatic hydrocarbons, which cause

A

reduction in oxygen transport

B

increase in blood pressure

C

cancer

D

retardation of growth of foetus.

Text Solution

Verified by Experts

The correct Answer is:
C
Cancer is caused by cells dividing repeatedly out of control . They cease to respond to the normal signals around them and from unspecialised masses of cells called tumours . Lung cancer usually starts in the epithelium of the bronchioles, so - called bronchial carecinoma . It then usually spreads throughout the lungs . It is caused almost exclusively by smoking . Tobacco smoke contains chemicals responsible for lung cancer . The most important of these are polycyclic hydrocarbons which are converted in the body to carcinogens.
Besides , carbon monoxide combines with haemoglobin and reduces oxygen transport by about 15% in smokers and nicotine increase blood pressure , heart rate and constriction of blood vessels.
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