Hi, Cigarette smokes causes miscarriage, preterm, Small for gestational age, but is not yet documented to cause fetal defects. But I would advise you to cut down /avoid cigarette smoking as much and as soon as possible. A lot of centres offer de-addiction services and should be tried. Passive smoking will be harmful to your newborn, who may have allergies and repeated respiratory infection due to it. Also cigarettes smokers usually tend to take addiction of other substances and alcohol more easily. So, as of now though he is clear of issues, cutting down on cigarettes is advised. Hope this helps. Regards.