Over 75 years, Hauer said lead exposure doubled the risk of schizophrenia for 89 million Americans, while quadrupling the risk of attention deficit disorder (ADHD) among another 170 million U.S. adults. The research also found a spike in anxiety, depression and neuroticism and a decrease in conscientiousness over the same period.
The authors note that lead exposures would have also occurred from lead pipes, contaminated food and soil, and airborne dust from lead-emitting industries and waste incineration, among other sources. However, all of the mental health disorders tracked in the study rose and fell with the prevalence of lead in gasoline.
https://www.vancouverisawesome.com/highlights/leaded-gasoline-legacy-linked-to-surge-in-schizophrenia-adhd-and-anxiety-disorders-finds-study-9902282