Why is it very dangerous for a pregnant woman to smoke during pregnancy?

what you take into your body is taken into your babies body- the chemicals and toxins in what you are smoking can cause low birth weight, premature birth, respiratory problems, etc. For your baby's health and your own- you should refrain from smoking, or better yet quit (as second hand smokle for oyur infant and child is just as damaging) when you are preganant!

Because many of the thousands of chemical in cigarettes cause birth defects. Fetuses are very sensitive to any chemicals because they are still developing. Anything taken in by the mother will effect the baby, including drugs, smoking, alcohol and nutrition. Additionally, blood vessels tend to narrow blood vessels, which can decrease the blood flow to the baby. Make sure the mother is taking folate supplements which reduce the risk of neural tube defects. Do not take Vitamin A supplementation, this can increase birth defects. Please consult a doctor for further information.
Otis dangerous for a pregant woman to smoke, it is bad for the baby.
Omg!Cause you can kill the baby,maybe even yourself
Don't do it,and smoking is dangerous by itself anyway.
Smoking affects more than the lungs, it affects the whole body. But for this question specifically. The umbilical cord will not be able to deliver the necessary nutrients to the baby, thus resulting in low birth weight and other problems that accompany it. If you want me to go into more detail then just email me.
Cause your baby will be RETARDED DONT DO IT!
It increases risk of birth defects, premature labor, low birthweight, and after the baby is born, it will scream for three days due to nicotine withdrawl. I've seen it happen. Not to mention it isn't good for you, either.