Falcon,
Ever heard of round up? Ever seen what this stuff does to plants? What do farmers use on tobacco plants to remove the suckers? So, someone breaks off the "sucker" and sprays round up down the plant to keep "suckers" from returning? All the while this poisonous chemical is being absorbed by the plant and later inhaled by a human....sounds healthy, huh?
But lets go a step further, your food whether it be beef, chicken, pork, these animals are given chemicals by either ingestion or shots to help their growth, etc, again being absorbed by human consumption at a later time.
Genetics is said to be the cause of many cancers, like lymphoma, but Falcon has a point, (not saying I agree), the person that was chemically altered to begin with that cause this mutation in the DNA strand, that in turn leads to this life threatening disease in their offspring, was exposed to something.
Cancer is not biased on who it affects, sex, ethnicity, age it doesn't matter! But notice it keeps affecting more and more people. We are projected to see a 20% increase of cases over the next 5-8 years.