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Alcohol, cigarettes, unhealthy food, stresses and other factors have a great influence on our health. The human’s immune system is very uncertain thing because there is a countless quantity of different dangerous viruses and bacteria.

The human’s immune system is very uncertain thing because there is a countless quantity of different dangerous viruses and bacteria. From ancient times plague and other infectious diseases have been killing people without leaving them any chance to survive. All these diseases are even worse than wars by the quantity of deaths.