Usually second-hand smoke gets into our lungs because we breathe it in a restaurant, at work or at home. But strangely enough, some of us get the poisons in second-hand smoke without having to breathe it. Who? The baby inside you when you are pregnant.
How can second-hand smoke harm the baby inside you? After all, the baby doesn’t breathe the air we breathe. It’s inside you, safe and sound. Right? Wrong. The baby gets blood and food through your blood. If you are a smoker, it gets something else too. It gets the poisons in the smoke, second-hand. These go from your lungs to your blood and from your blood to your baby.
What poisons are we talking about?
Carbon monoxide, the deadly gas from a car’s tailpipe
cadmium, a metal used in batteries
toluene, an industrial solvent know to cause cancer
nicotine, a chemical used to kill bugs
your baby gets these poisons even if you are just breathing somebody’s else’s smoke.
What can happen to your baby? Just like the babies of smoking mothers, babies of women who breathe smoke at work or at home have lower weight at birth. Lower weight babies are more likely to get sick and spend time in the hospital. Why? Because the more smoke you breathe, the less oxygen the baby gets, and the less it can grow. The more smoke you breathe in, the more your baby gets the poisons in the smoke. And the more likely that you baby will get sick.
"second-hand" does not mean harmless. If you’re pregnant and you smoke, try to quit. If you do not smoke, but find yourself around those who do, tell them to go outside. Your baby needs fresh air before and after it is born.

exposure of non-smoking women to second-hand smoke during pregnancy causes reductions in fetal growth, and there is also evidence that postnatal exposure of infants to second-hand smoke contributes to the risk of sudden infant death syndrome (sids).
-kristin