It may also naturally form inside the mouth or stomach if a consumer product contains precursors for nitrosamines.
This occurs mainly when the Ph levels in the mouth of the stomach are acidic, which allows the nitrates or nitrite added to food to combine with amines to form nitrosamines.
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According to Science Direct: “Nitrosamines are considered to be strong carcinogens that may produce cancer in diverse organs and tissues including lung, brain, liver, bladder, stomach, oesophagus and nasal sinus.”
Not all cured meats have detectable levels of the compounds, but fried bacon has consistently been found to contain the carcinogen.
Source: Daily Express