Fetal lung and placental methylation is associated with in utero nicotine exposure.
Chhabra D, Sharma S, Kho AT, Gaedigk R, Vyhlidal CA, Leeder JS, Morrow J, Carey VJ, Weiss ST, Tantisira KG, DeMeo DL. Fetal lung and placental methylation is associated with in utero nicotine exposure. Epigenetics. 2014 Nov; 9(11):1473-84.