New research links fetal tobacco exposure, particularly during the third trimester of pregnancy, with poorer attention in infants as early as 9 months of age. For more information please see Shisler, S., Eiden, R., Molnar, D. S., Schuetze, P., Coles, C., Huestis, M., Colder, C. (2016). Effects of fetal tobacco exposure on focused attention in infancy. Infant Behavior and Development, 46, 1-10.