Why is smoking harmful?
Cigarette smoking is known to be the main cause of lung cancer. It also causes bronchitis, heart disease and other problems with the circulation. Cigarette smoke contains many harmful substances, which are all deposited straight into the lungs. The smoke contains tiny particles of soot that can clog the air passages. The tar in smoke contains substances that can cause cancer. The nicotine in cigarettes is a strong addictive drug that can affect the heart and circulation. However, this addiction can be very difficult to break.
The harmful effects of cigarettes may only appear after many years of smoking. However, even when a smoker gives up the habit, it can be years before these health risks are cancelled out.
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