I don't have tumors or cancers because I medically check myself once in a while, but I still avoid eating junk food or overly processed food except seldom to avoid increasing my own risk of contracting ailments or maladies.
When there is party like a barbecue, I am very voracious on the meat because I eat it sparingly (but I eat the type of meat you purchase almost 0 KM away from your own trusted family-led butcher shop)
It's called common sense.
I'll remind that :)