Nitrosamine is a potent carcinogen and one of the most important chemical carcinogens.
Nitrite, the precursor substance for the production of nitrosamines, is widely found in nature, especially in food. However, most of the nitrite will be excreted with urine, only under specific conditions will be converted into nitrosamines, usually under the conditions of ingested nitrite is not harmful to human health.
Only in the case of excessive intake of nitrite, and the human body lack of vitamin C will cause harm to the human body, easy to induce cancer.
Smoked or salted fish contain high levels of nitrites, and excessive consumption of this food can lead to an increased incidence of cancer. Especially when these smoked or salted foods are ingested together with alcohol, the danger of nitrosamines to human health will increase exponentially. Therefore, these foods should be consumed sparingly in general.
If you feel unwell, it is recommended that you seek medical attention promptly.