Nitrosamines and other nitrosyl compounds are found in pickled vegetables, smoked meats, and the water supply of certain geographic regions where the incidence of esophageal squamous cell carcinoma is high. In regions in which the soil is deficient in molybdenum and zinc, plants are impaired in their ability to metabolize nitrites to ammonia. This impairment permits potentially toxic nitrogen compounds to accumulate within plants that enter the human food supply.
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