And what that does is it lowers the amount of oxygen content in the blood of that mother and that will lower the amount of oxygen that is received by that developing fetus. So eventually smoking can basically cause many different types of problems. For example, it can lead to premature birth. It can also lead to an underweight fetus, a fetus that is below the normal weight. Now, it can also produce different types of birth defects. It can produce different types of problems within the heart.