Many things: Cancer-causing substances are called "carcinogens." they include uv radiation from the sun, radon, agricultural chemicals that get into the water supply, certain types of plastics like bpa, and many others. A report from the president's cancer panel gives more details. Go to: http://deainfo.Nci.Nih.Gov/advisory/pcp/annualreports/pcp08-09rpt/pcp_report_08-09_508.Pdf.
Answered 9/9/2014
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Multiple factors: Too many to enumerate here, but toxins, pollutants and heavy metals are high on the list.
Answered 9/15/2013
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