American doctors say that mothers smoke before their (76) babies are born may slow the growth of their babies (77) lungs. They say’ reducing lung growth could cause (78) the babies suffer breathing problems and lung disease (79) late in life. Doctors in Boston studied 1,100 children. (80) The mothers of some of the children smoked; the other (81) Mothers did not. Doctor found out that the lungs of the (82) children whose mothers smoked were 8% less developed as (83) the children whose mothers did not smoke, that the (84) children whose mothers smoked were developed 20% more (85) cold and breathing diseases than the other children.