There is no proof that they cause cancer in humans. Any food dyes or cosmetics that were linked to cancer are no longer used. Some of these cosmetics had caused cancer in lab animals. Hormones fed to cattle to make them gain weight are strictly controlled today. Tiny amounts of these hormones in beef are not likely to increase people's risk of cancer.
People use pesticides to control or eliminate unwanted plants, fungi, or animals including insects.
Pesticides that come from biological sources came out more recently. They are unlikely to cause cancer. Still, most of those used now and in the past are chemical. There are many kinds, and they have different health effects on humans. They get most of their evidence from studying people who are exposed to pesticides at work.