1·Second-hand contains carbon monoxide, ammonia, formaldehyde a pyrene and nitrosamines.
二手烟包含了一氧化碳，氨，甲醛，苯和亚硝胺。
2·Other substances such as nitrosamines, arsenic, and some radioactive elements can also be carcinogenic.
其他物质如亚硝胺、砷和一些放射性元素也有致癌作用。
3·Processed and cured meats contain nitrites which are added to help preserve the meat. When ingested, these break down into nitrosamines and other chemicals that are thought to be cancer-causing.
因为有利保存，加工肉类或盐腌肉类添加了亚硝酸盐，进食后亚硝酸盐会分解成可致癌的亚硝胺和其它化合物。
4·Put them together, it will result nitrite, which would increase the chance of producing nitrosamines.
两个放在一起，会产生亚硝酸盐，而增加亚硝胺产生的机会。
5·Star Scientific sued RJ Reynolds, a unit of North Carolina-based Reynolds American, in 2001 over a method of treating tobacco to prevent the formation of tobacco-specific nitrosamines.
2001年，星科公司就一项防止烟草专有的亚硝胺形成的烟叶处理方法，对位于北卡罗来纳的雷诺美国公司的子公司雷诺烟草公司提起了诉讼。