I see some scientists have done some studies suggesting that bacon and red meat cause cancer. Their conclusions appear to be based on fundamentally weak methodology.
What they say might be true or might not be, but it isn’t at all clear that they have proved their case based on the studies they have conducted.
I do know, however, the greatest cancer causing agent: The US Government. And as an agent of death, it goes well beyond cancer. Consider,
Atomic bombs dropped on Hiroshima and Nagasaki. An epidemiology study by the RERF states that from 1950 to 2000, 46% of leukemia deaths and 11% of solid cancer deaths among the bomb survivors were due to radiation from the bombs.
Agent Orange was dropped on Vietnam during the war there.