This is what I’ve been struggling to communicate to people for years:

“When we heard that a disease was linked to a gene, we used to think that by definition that meant it was inherited, and therefore not preventable. Now, when I hear the Human Genome Project has discovered yet another disease is linked to a gene, I don’t ask about the source of mutation, I ask what contaminants might be altering that gene’s expression. It turns out that happens a lot.”

-Dr. Pete Myers, “Our Stolen Future – Revisted.”