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. It damages the alveoli making it harder to breathe. Tar from the burning tobacco can cause lung cancer Nicotine can cause hardening of the arteries and high blood pressure increasing the risk of heart attacks and strokes Carbon monoxide in tobacco smoke reduces the amount of oxygen that the blood can carry 2. Smoking can partially deprive the fetus of both these nutrients. Smoking is a frequent cause of early miscarriage in pregnancy.