Healthcare Quit smoking to lower risk of premature birth Updated : April 21, 2019 10:07 AM IST The good news is that the proportion of women who start their pregnancy as smokers has been declining in recent years. Only about 25 percent of women who smoked prior to pregnancy were able to quit throughout their pregnancy. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.