Any substance which flows through a pregnant woman's blood stream; whether it be positive or negative, debilitating or helpful, will pass through placental walls to the developing child she carries. If one considers how negatively toxic substances such as cigarettes, alcohol, and cocaine affect the physical and mental state of a fully developed and healthy adult, it is possible to understand how devastating the effects these same substances have on a child in utero and throughout the course of their development. Examining prevalence rates and current research in the area of how exposure…