I heared this too, and found it quite shocking that some teenage mothers smoke while pregnant to deliberately increase their chance of having a smaller baby in the hope that it will be a less painful labour, especially when its supposed to be the other way round, the bigger the baby the easier the birth.
I know a woman who smoked while pregnant and her baby was born a week overdue and weighing only 6lb something, and with an under developed pancrease (is that how you spell it?).
She said all along that she didn't see the point in quitting, that it would do no harm, wonder if shes quite so sure of that now.
But as for the baby becoming addicted to nicotine, I don't know but would guess that yes, they would probably have a slight addiction and maybe cry more than most newborns.
On a similar note, news out today is that breastfed babies turn out to be more inteligent than formula fed babies but only because the mums tend to be more inteligent in the first place, quite controversial I should imagine, and my own opinion is that its a load of codswallop.