As you already know smoking is very dangerous to health even if you are not pregnant. If you smoke during pregnancy then chances are that you may lose success in IVF process.
IVF is a process in which sperm fertilizes the egg out of the body.
The amount of Tar and nicotine present in cigarettes increases the chances for a woman to become infertile.
Infertility means unable to stay pregnant.
If you decide to quit smoking while you are about to get pregnant then it's a good chance for you to abandon smoking for life.
While a baby is in the womb of a woman, it takes everything from it's mother like oxygen & food. So if a mother is smoking while she is pregnant then that means she is making her to smoke nicotine and tar instead of oxygen. A baby in the womb must be given fresh and only oxygen nothing else otherwise baby will have to strive harder to get oxygen inside the womb.
Those babies who are born to mothers who smoke while pregnancy are born with lesser birth weight than average.
Their some organs are not regular than the ones born to the mothers who don't smoke.
Their lungs may have any disorder.
Their body is like opened to diseases and very sensitive than other babies.
A baby can also die in the womb if the mother is smoking cigarette. A lot of cases like this have happened around the world that the mother used to smoke while she was pregnant and her baby died in the womb.
So in short, smoking cigarette is bad for your health and if you are pregnant then it's bad for you baby in the womb as well. Don't play with your baby's life by smoking cigarette while you're pregnant. Bear a little for sake of your baby and have a healthy life. Thank You.