Processing & preservatives / sodium. They are not the best choice.
One of the questions I'm most asked about has to do with "nitrates" or "nitrites" that are listed in the ingredients on some cold cut packages.
Sodium Nitrite helps prevent the growth of Clostridium botulinum, which can cause botulism in humans and is also used alone or in conjunction with sodium nitrate as a color fixative in cured meat and poultry products (bologna, hot dogs, bacon). During the cooking process, nitrites combine with amines naturally present in meat to form carcinogenic N-nitroso compounds. It is also suspected that nitrites can combine with amines in the human stomach to form N-nitroso compounds. These compounds are known carcinogens and have been associated with cancer of the oral cavity, urinary bladder, esophagus, stomach and brain.
What I would do is buy a Meat Slicer or cut it yourself if you are skillful with a Chef knife and cook your own meat.