Toxic substances like nicotine, carbon etc., get deposited on the inner walls of the blood vessels that carry blood to the heart.
This leads to formation of plaque which eventually damages the heart muscle leading to heart attack.
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Effects of smoking on digestive system
Smoking causes heart burn, delays healing of peptic ulcer, increases risk of Crohn's disease and formation of gallstones.
It causes stomach cancer.
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Effects of smoking on reproductive system
In women, smoking creates imbalance in estrogen hormone and reduces blood blood to genital organs. Smoking increases the chances of abortion, miscarriage, premature birth and foetal death.
In men, smoking causes damages to male reproductive system and develop high risk of impotency.
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Effect of nicotine on health
It stimulates the release of adrenaline which increases the blood pressure.
Increase in blood pressure leads to heart diseases.
In pregnant women, it causes retardation and abnormal growth of the foetus.