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. Our aim was to make the links between carcinogens on the one hand, and the specific products and places they are found on the other. This task turned out to be more complicated and time consuming than we had expected. While such a chart showing the links between known carcinogens and their pathways will be useful, it will by no means tell us everything we need to know. There are about 75,000 different chemicals now in use and only 1200 to 1500 of these have been tested for carcinogenicity.