Salted fish. . Fish sauce, shrimp paste, salted eggs, pickles, sausages, ham and smoked pork contain more carcinogenic substances of nitrite, and should be eaten as little as possible.

barbecue food. Roast beef, roast duck, roast mutton, roast goose, roast pork, etc. Because it contains strong carcinogens, it is not advisable to eat more.

smoked food. Such as bacon, smoked fish, smoked eggs, smoked dried tofu, etc., also contain benzopyrene carcinogens.

fried food. After frying, polycyclic aromatic hydrocarbons (PAHs) are produced. After the coffee beans are burnt, Oil pancakes, stinky tofu, fried taro horn, fried dough sticks, etc., mostly use repeated oil, which will produce a carcinogenic decomposition product at high temperature.

moldy food. Rice, wheat, beans, corn, peanuts and other foods are susceptible to moisture and mildew, which will produce various carcinogenic toxins after being contaminated by mold.

overnight cooked cabbage. It will produce nitrite, which will be converted into carcinogenic substance of ammonium nitrite in the body.

betel nut. Chewing betel nut is a factor causing oral cancer.

potable water and ditch water. Gastric cancer, esophageal cancer and liver cancer are all related to drinking pond water. People who regularly drink unboiled tap water will have a 21% higher risk of bladder cancer and a 38% higher risk of rectal cancer.