Wikipedia
N-Nitrosodimethylamine
N-Nitrosodimethylamine (NDMA), also known as dimethylnitrosamine (DMN), is a semi- volatile organic chemical, produced as by-product of several industrial processes and present at very low levels in certain foodstuffs, especially those cooked, smoked, or cured. NDMA is water-soluble, colorless, and its taste and odor are weak or absent. It is toxic to the liver and other organs, however this is currently an issue of debate.