Smoking produces free radicals in the organism. Free radicals are molecules that very easily react with other molecules. Thus they can damage many structures in the cells and the organism itself. The immune system fights with the free radicals. By quitting smoking, you allow the immune system to fight with microorganisms, one of which is human papiloma virus, instead of wasting time with free radicals.

However, quitting smoking will not help you get completely rid of them. It might only increase the chance of getting rid of them. Other products like aloe vera, for example, might increase the immune system. Many antioxidant over-the counter products (for example vitamin C, vitamin A & E) act against the free radicals. Many of these facts are still not completely studied, but the experience has shown that certain substances can help the immune system either by taking part of its work or by increasing its strength directly.