Pesticide Residue Suspected as Potential Catalyst for Rising Lung Cancer Rates in Non-Smokers Under Age 50

New research suggests pesticides in produce and grains may increase lung cancer risk for non-smokers under 50. Discover the data from USC's latest study.

By: AXL Media

Published: Apr 18, 2026, 10:50 AM EDT

Source: Information for this report was sourced from EurekAlert!

Investigating the "New Epidemic" of Early-Onset Lung Cancer

While tobacco use remains the leading cause of lung cancer, a distinct and troubling trend has emerged: rising diagnosis rates among non-smokers under the age of 50. This shift is most pronounced in women, who are now more likely than their male counterparts to develop the disease at a young age. To investigate this phenomenon, researchers at Keck Medicine of USC launched the Epidemiology of Young Lung Cancer Project, analyzing 187 patients diagnosed by age 50. The results, presented at the American Association for Cancer Research (AACR) annual meeting, indicate that these cancers are biologically distinct from those caused by smoking and may be linked to unexpected environmental triggers.

The Counter-Intuitive Link Between Healthy Eating and Cancer Risk

The study utilized the Healthy Eating Index (HEI), a 100-point scale used to measure diet quality based on federal guidelines. Surprisingly, young non-smoking lung cancer patients scored an average of 65, notably higher than the national average of 57. These patients consumed more daily servings of dark green vegetables, legumes, and whole grains than the general U.S. adult. Lead investigator Dr. Jorge Nieva noted that while these foods are generally beneficial, the data suggests that for this specific demographic, a higher intake of these items correlates with a greater risk of developing lung cancer.

Pesticide Residue: The Suspected Environmental Risk Factor

Researchers speculate that the common denominator in these healthy diets may be pesticide residue. Commercially produced, non-organic fruits, vegetables, and grains typically carry higher residues than meat, dairy, or processed foods. This theory is bolstered by existing agricultural data showing that workers frequently exposed to pesticides experience higher rates of lung cancer. The study highlighted that women in the participant group had higher diet quality scores than men, which aligns with the higher incidence of early-onset lung cancer observed in women.