“…The rapid rise of ADHD cannot be attributed to genetic mutations. Indeed, multiple social and environmental risk factors have been associated with the development of ADHD, including family-related factors [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ], maternal obesity [ 16 , 17 ], maternal smoking [ 8 , 18 , 19 , 20 ], maternal drinking [ 8 , 21 ], low birthweight and preterm birth [ 22 ], exposure to organophosphates [ 23 ], polychlorinated biphenyls [ 24 , 25 ], and lead exposure [ 24 , 26 , 27 , 28 , 29 ]. These findings underscore the role of environmental factors in the etiology of ADHD, and the need to explore other important yet unknown risk factors for ADHD [ 30 ].…”