1. nitrosamine is a chemical carcinogen, which has strong carcinogenicity and can cause various cancers in animals. Deteriorated vegetables and foods are high in content, which can cause tumors in digestive system, kidney and other organs. There are many foods containing this chemical, and nitrite exists widely in nature. Many foods contain nitrite, including fish, eggs, sausages, pickles, fermented bean curd, bacon, pickled mustard tuber and so on. Vegetables, meat and beans ...

2. Polycyclic aromatic hydrocarbons (PAHs) are carcinogens represented by benzopyrene, which can cause skin cancer when applied to animal skin, and sarcoma when injected subcutaneously. This substance is widely found in asphalt, automobile exhaust, soot, cigarettes and smoked food.

3. Aromatic amines, widely used in rubber, pharmaceutical, printing and dyeing, plastic and other industries, can induce urinary system cancer. Aromatic amines have high boiling points.