(Beyond Pesticides, May 1, 2026) A study in Psychiatry Research, entitled “Toxic Exposure and Rates of Suicidal Thoughts and Behaviors Among U.S. Military Veterans,” adds to the body of science linking poorer mental health among military members with exposure to environmental contaminants. While previous research focuses on mental health broadly, the current observational cohort study focuses on exposure to toxic substances and suicidal thoughts and behaviors (STBs) through the analysis of data from 248,926 U.S. veterans enrolled in the Million Veteran Program (MVP). In comparing self-reported exposures to nine toxicants, including Agent Orange, chemical/biological weapons, anthrax vaccine, solvents/fuels, petroleum combustion products, lead, other metals, pesticides, and open-air burn pits, and mental health records, the researchers find that military veterans with higher toxic exposures are more likely to have STBs.

The authors also report that these associations occur across all major service cohorts (pre-Vietnam, Vietnam, post-Vietnam, Gulf War, and post-9/11 eras). “Our work contributes to growing evidence that veterans who report more toxic exposures are more likely to have STBs, consistent with greater risk for other mental health outcomes (e.g., depression, PTSD [post-traumatic stress disorder]),” the researchers conclude.