Inpatient Obstetric Nurse (NCC) Practice Exam 2026 - Free NCC Practice Questions and Study Guide

Smoking is identified as a behavioral risk factor associated with placenta previa due to its potential to affect placental implantation and subsequent vascular health. When a woman smokes during pregnancy, there is an increased risk of various complications, including issues with placental placement. The toxic chemicals in cigarettes can lead to changes in blood flow and oxygenation, both of which are critical for maintaining a healthy pregnancy and placenta placement. This impact on the vascular system can contribute to abnormal implantation of the placenta, which is the defining characteristic of placenta previa.

In contrast, while other factors listed may carry some risk in broader contexts of obstetric complications, they are not specifically linked to the development of placenta previa like smoking is. This highlights the unique nature of smoking as a notable risk factor in the context of this condition.