Cancer is a deadly disease that occurs due to cellular changes in the body caused by certain genes. While some of those changes occur through the natural process of DNA replication while others are the unfortunate results of poor lifestyle habits and exposure to environmental toxins contained in tobacco smoke, food chemicals, household utensils, radiation, UV rays, etc. Here is a list of carcinogens that are most likely to affect our health. However, exposure to carcinogens does not make cancer inevitable. Various factors determine whether or not one will develop cancer after being exposed to carcinogens. These include your genetic profile, duration of exposure and other factors.