".. There are scores of chemicals that are classified as known carcinogens for other types of exposure but that aren’t currently regulated in the workplace. One chemical of particular concern to environmentalists is Bis (2-chloroethyl) ether, a pesticide ingredient related to a chemical used in World War I mustard gas. According to the report, the “estimated cancer cases per 1,000” for Bis range from 730 to 940 — meaning that most people exposed at currently acceptable levels will develop cancer. . ."

[ Workplace toxins report released — cancer-causing agents scruntinized. By Malcolm Maclachlan (published Thursday, January 10, 2008)
http://www.capitolweekly.net/article.php?xid=wthvy8jmeo0ryo     ]

 Bis(2-chloroethyl) ether is made in factories, and most of it is used to make pesticides. Some of it is used as a solvent, cleaner, component of paint and varnish, rust inhibitor, or as a chemical intermediate to make other chemicals. 

Animal studies show effects similar to those observed in people. These effects include irritation to the skin, nose, and lungs; lung damage; and a decrease in growth rate. Animals that survived the exposures recovered fully in 4 to 8 days. Some animal studies indicate that bis(2-chloroethyl) ether can affect the nervous system resulting in sluggish and slow movement, staggering, unconsciousness, and death. 

We do not know if bis(2-chloroethyl) ether causes reproductive effects or birth defects in people or animals.  ...

http://www.atsdr.cdc.gov/tfacts127.html