Bacon, Hot Dogs, Potato Chips, and a bunch of other things have been listed as potential causes of some types of cancers. The acrylamide that is used
in many potato chips and fries has been shown to be a carcinogen. Additionally, there are concerns over the nitrates, which are used to make some
types of meat appear more red and prevent some bacteria, changing into a carcinogen during cooking :
During the cooking process, nitrites combine with amines naturally present in meat to form carcinogenic N-nitroso compounds.
Nitrite is added to certain foods to prevent the growth of the spore-forming bacterium Clostridium botulinum, whose toxin causes botulism,
leading to paralysis and potentially, death. Botulinum toxins are the most toxic compounds known, 15,000 times more potent than nerve gas (100,000
times more potent than the nerve gas sarin). The word botulinum comes from the Latin word botulus, meaning sausage, which was responsible for many
deaths centuries ago, before the advent of curing with nitrite. In addition to functioning as an antimicrobial agent, nitrite is used to produce the
characteristic flavour, texture, and pink colour of cured meats.
Foods to which nitrite is added include bacon, fermented sausage, hot dogs, bologna, salami, corned beef, ham, and other products such as smoked
or cured meat, fish, and poultry.
Second its been well known for a long time that foods with high saturated fats cause increased chances of certain types of cancers, such as breast
and colon cancer.
There are of course arguments, both ways, on the risk of eating such things. If you are very concerned about it though, I would avoid as much fat as
possible and eat only natural unprocessed meats.
Pigs will eat anything. 
