The one thing that does not cause cancer is...
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There is just one thing that is probably not carcinogenic to humans, according to an analysis of more than 900 substances and occupations by The World Health Organizations International Agency for Research on Cancer for their potential to cause cancer in humans.
That thing is caprolactam, a substance used to make synthetic fibers like nylon, which is used in yoga pants, as well as common household items like brush bristles. While even short-term exposure to this substance (like what people who work in factories that use this substance encounter) can cause your eyes and throat to burn, give you headaches and make you confused, it apparently does not cause cancer, the WHO reports.
more here:
http://www.marketwatch.com/story/the-one-thing-that-does-not-cause-cancer-is-2015-10-26?siteid=rss&rss=1