2.47 biological effects of smoking

1. Cigarettes have tars which can bring about lung cancer.
2. Tars contain polycyclis hydrocarbons. They attack the cells in the lungs and cause cancer.
3. They can also cause long-term bronchitus, this is a damage to the cilia cells of the treachea and the bronchi, inflammation. This also has an excessive mucus production.
4. Cigarettes also contain nicitine. It increases blood pressure.
5. Nicotine causes clotting in the bloodstream and heart damage.
6. They contain carbon monoxide which reduces the supply of oxygen. In a pregnant woman, carbon monoxide can reduce oxygen supply to the growing fetus.