Nicotine addiction is one of the toughest habits to kick. Expecting moms have an added incentive: their newborn's health. For your baby, quitting early in pregnancy is almost as good as being a non-smoker.

Past studies have shown that women smokers have a higher risk of cervical cancer. Now, new research shows that second-hand smoke may damage cells in a woman's cervix, increasing her risk of cervical cancer.