Reducing or eliminating exposures to environmental carcinogens would dramatically reduce the prevalence of cancer in the United States. Cancer occurs when a cell's genetic material, its DNA, is damaged repeatedly. Cancer is a multi-step process, requiring perhaps 5 or 6 or more separate attacks on a cell before cancer develops. If the rope is cut, then you have a cancer. You can think of carcinogens as bullets being fired at the rope.
Most bullets miss the rope completely.
A few hit the rope and damage it. As time passes and more and more carcinogens are fired at the rope, eventually the rope may be cut and cancer develops. Certain drugs including supplemental estrogens, steroids and tamoxifen. Carcinogens enter our bodies through the air, food, soil and water. We have not, however, managed to organize this information into a concise, useful information sheet.