How does smoking affect the placenta?

From an abstract in PubMed.gov, it is likely that early pregnancy chronic exposure to tobacco constituents can affect placental development directly or indirectly by reducing blood flow, which creates a pathologically hypoxic environment that will result in an underdeveloped child.

Additional issues are:

Sudden Infant Death Syndrome (SIDS) is a group of motor conditions that cause physical disabilities, mental retardation, learning difficulties, premature rupture of the membranes, placental abruption, placenta previa, and premature birth.

If you choose this option, just consider the price it will cost you, the baby, and all of us.

Smoking affects the placenta by reducing its blood flow and oxygen delivery to the fetus, leading to restricted growth, premature birth, and low birth weight. It can also increase the risk of placental abruption, where the placenta separates from the uterine wall prematurely, potentially causing life-threatening complications for both the mother and the baby. Additionally, smoking during pregnancy is associated with an increased risk of placenta previa, a condition where the placenta partially or completely covers the cervix, leading to bleeding and potentially necessitating a cesarean delivery.