Describing toxicity as "the most underrated threat facing humanity", a new report has warned that the "contamination of humans is endemic" and that the risks to planetary and human health are "widely underestimated", with the impact of pesticide use on cancer rates potentially rivalling that of smoking. More than 3,600 synthetic chemicals from food contact materials, such as packaging and pesticides, are present within human bodies globally, the report revealed, 80 of which are feared to be especially dangerous. Chemicals known as Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS) were found in almost everyone tested, with 14 per cent of European teenagers having blood levels high enough to pose serious health risks. Among the shocking findings is the link between pesticide use and leukaemia, non-Hodgkin's lymphoma, and bladder, colon and liver cancer " including suggestions that prenatal pesticide exposure increases the odds of childhood leukaemia and lymphoma by more than 50 per cent. Evidence was also gathered showing that synthetic chemicals humans are exposed to have contributed to a global decline in sperm counts. The report outlines "strong" causal and correlational links between toxicity and a variety of severe human health conditions, including cancer, obesity, Alzheimer's, pregnancy complications, ADHD, fertility issues, heart conditions, and respiratory ailments.