This document summarizes the adverse effects of smoking during pregnancy. It notes that 8-10% of pregnant women in Korea smoke, and smoking during pregnancy causes about 910 infant deaths annually in the US. The document outlines that cigarette smoke contains over 4,000 chemicals including carbon monoxide, nicotine, cyanide, and arsenic. These chemicals reduce oxygen delivery to the fetus and impair cellular processes. Prenatal smoking exposure can affect brain development through stimulation of nicotinic receptors. Adverse outcomes for the baby include low birth weight, intrauterine growth retardation, physical and mental development problems, and an increased risk of SIDS. Smoking during pregnancy also increases risks of placental problems, premature delivery, and some birth