Not really a surprise, and there are some really nasty pesticides, that are a problem because they don't break down. It just seems to be another one of the things about a 'civilized' lifestyle, that can be a serious danger to long term health. In the short term they may make many things seem easier, but in the long term we have yet to see some of the most serious effects. Particularly with the way a number of these things can compound problems.