Processed meats and bacon: These meats almost always contain the same sodium nitrite found in hot dogs. You can find some without nitrites, but you'll have to look for them in natural grocers or health food stores. Bacon is also high in saturated fat, which contributes to the risk of cancers, including breast cancer. Limiting your consumption of processed meats and saturated fats also benefits the heart.
Doughnuts: Doughnuts contain hydrogenated oils, white flour, sugar, and acrylamides. Essentially, they're one of the worst cancer foods you can possibly eat. Reader's Digest calls doughnuts "disastrous" as a breakfast food, and many experts agree it's probably one of the worst ways to start the day.
French fries: Fries are made with hydrogenated oil and fried at high temperatures. Some chains even add sugar to their fry recipe to make them even more irresistible. Not only do they clog your arteries with saturated fat and trans fat, they also contain acrylamides. They should be called "cancer fries," not French fries.
Chips / crackers / cookies: These generally contain white flour and sugar as well as trans fats, but it's not enough to simply look for these ingredients on the label; you have to actually "decode" the ingredients list that food manufacturers use to deceive consumers. They do this by hiding ingredients (such as hiding MSG in yeast extract, or by fiddling with serving sizes so they can claim the food is trans fat free, even when it contains trans fats (the new Girl Scout cookies use this trick)