Nitrosamines are a group of chemical compounds that can form when nitrites and nitrates, commonly found in processed meats and some vegetables, react with amines, which are organic compounds. These substances are of concern because some nitrosamines have been linked to an increased risk of certain types of cancer, particularly in laboratory studies. Nitrosamines can be found in various products, including tobacco smoke and certain cosmetics. To reduce exposure, it is advisable to limit the consumption of processed meats and to be aware of the ingredients in products containing nitrites and nitrates.