The American Agricultural Health Study (AHS) assessed
pesticide applicators and their spouses and found diverse results
in relation to pesticides and suicide: an analysis of 110 suicide
cases did not find a significant association between prior pesticide
use and suicide (Beard et al., 2011). Another analysis, from the
same study, found a positive association between exposure to the
organophosphate chlorpyrifos and suicide rates in groups with
greater cumulative exposure and more intense exposure (Lee et al.,
2007).