Processed meats, a cancer causing agent.

 Bacon, ham and sausages rank alongside cigarettes as a major cause of cancer, the World Health Organisation has said, placing cured and processed meat in the same category as asbestos, alcohol, arsenic and tobacco.
Processed meat is now ranked as a group 1 carcinogens because of a causal link to bowel cancer, while placing red meat in group 2A as "[probably carcinogenic to humans".