When you quit, your baby will more likely be born at the right time and at a healthy weight; more likely to be born without birth defects; and less likely to die from Sudden Infant Death Syndrome (SIDS). You also lower the chances of your baby suffering from illness in their early years.
By quitting, you will be less likely to have a miscarriage or problems during pregnancy, such as excessive bleeding and high blood pressure. You also will be less likely to have problems during birth and have a better chance for safe labor.