<P> Health effects of pesticides may be acute or delayed in those who are exposed . A 2007 systematic review found that "most studies on non-Hodgkin lymphoma and leukemia showed positive associations with pesticide exposure" and thus concluded that cosmetic use of pesticides should be decreased . Strong evidence also exists for other negative outcomes from pesticide exposure including neurological problems, birth defects, fetal death, and neurodevelopmental disorder . </P> <P> According to The Stockholm Convention on Persistent Organic Pollutants, 9 of the 12 most dangerous and persistent chemicals are pesticides . </P> <P> Acute health problems may occur in workers that handle pesticides, such as abdominal pain, dizziness, headaches, nausea, vomiting, as well as skin and eye problems . In China, an estimated half million people are poisoned by pesticides each year, 500 of whom die . Pyrethrins, insecticides commonly used in common bug killers, can cause a potentially deadly condition if breathed in . </P> <P> Many studies have examined the effects of pesticide exposure on the risk of cancer . Associations have been found with: leukemia, lymphoma, brain, kidney, breast, prostate, pancreas, liver, lung, and skin cancers . This increased risk occurs with both residential and occupational exposures . Increased rates of cancer have been found among farm workers who apply these chemicals . A mother's occupational exposure to pesticides during pregnancy is associated with an increases in her child's risk of leukemia, Wilms' tumor, and brain cancer . Exposure to insecticides within the home and herbicides outside is associated with blood cancers in children . </P>

Acute health effects of exposure to pesticides include