Pollution is a major factor that interferes with the biochemistry of our cells. This can lead to cancer. Traffic pollution has been shown to be associated with a higher incidence of breast cancer. Nitrous oxide is the determinant factor that results in the higher incidence of breast cancer. The rate of cancer doubles when you compare the highest quartile and the lowest quartile of nitrous oxide concentration in the environment. Today's health care system is oriented to blocking symptoms that cause illness, not the cause of the illness. Sometimes this is the only solution we have. Lifestyle is the best way to prevent disease and restore health.