Explain how it can impact the immune system, respiratory system, and the liver

Choose a single toxicant, and explain how it can impact the immune system, respiratory system, and the liver. This paper should consist of a minimum of two pages and utilize at least two reliable references in addition to the textbook. One of your references must be a peer-reviewed resource. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.