Immunity means being protected from the harmful effects of a disease.
The white blood cells in circulation within the bloodstream act as the main agents for recognition and defence against such diseases. Disease-causing microbes have outer coats made of protein called antigens. When these germs get into your body the white blood cell system is stimulated by the foreign nature of these proteins and produces specific antibodies against them. Smoking and health Inhaling hot smoke-filled air through the mouth and via the bronchi into the lungs pollutes the respiratory system. The natural cleaning system of the ciliary cells of the bronchial lining becomes damaged and inactive.