I smoked the entire pregnancy with my Son who is now 4. He is fine. He is extremely bright! I was worried when I got pregnant if it would affect him, but he was absolutely perfect. He does have a severe dairy allergy, but I don t believe it is related. He even got a perfect apgar score when he was born. I also have 5 different friends who all smoked heavily while they were pregnant. All of their children are fine as well. I wouldn t worry about it.