I smoked. My son was a doll. He was valedictorian of his class at the harded private school in the area and entered Harvard at 17 with sophomore standing.
PHEH on these phony studies.
You cheated him out of two Nobel Prizes and the Papacy. ;)
I smoked while I was pregnant with my first 2 children. They are now 35 and 34. My daughter, the first born, was and is the most mellow, sweet tempered person you would ever want to meet. Her brother ,on the other hand, was a tough child to raise. He's now a Dad himself and a wonderful, responsible adult.
By the way, when I was pregnant 36 years ago all the Dr.s were concerned with was weight gain. They had no problem with my smoking. Quit cold turkey when I was pregnant with my 3rd.
Times have changed.