Mothers who smoke are more likely to deliver smaller babies even after a full-term pregnancy, increasing the risks of birth defects and neurological disorders later in life, say researchers from McGill University. The team of researchers, which includes Assistant Professor Michael Dahan and Ido Feferkorn of the McGill University Health Care Center, examined the effects of smoking on more than nine million deliveries in the Unites States over 11 years, one of the largest studies to date.