A friend of mine just had her baby. She smoked while she was pregnant and is still smoking now. She is breastfeeding and is producing way more than her baby needs. I have been looking up the risks of smoking and breastfeeding and am very confused. It seems that no one can say either way that nicotine is transfered through breast milk. Can anyone tell me if it does and how long it takes for it to be out of your system. She just wants to know if she smokes three hours before she nurses what are the chances of the nicotine still being in the breast milk?