Quote Originally Posted by TuffStuffMcGruff
How? The smoke can't be going into the lungs.
Errr, through chemicals in the mother's blood exchanging with her child's blood through the placenta (is it called like this in english?). Tobacco does not hold problems with the lung, although this is the worst and most obvious one

Same as some substances give problems to a baby to be development, tobacco has flows as well for pregnant women...