calvin john hobel: sometimes it's hard to look at just the effect of smoking by itself, because smoking women have other habits that compound the effect of smoking. for example, nutrition. women who smoke tend to have poor nutrition. they may also be the person who's not taking their vitamins so they have a folic acid deficiency. so when you combine poor nutrition and not taking adequate vitamins, then in combination, that can lead to more serious problems. women often become more health conscious when they become pregnant. and that often translates into a more healthy diet. women aren't "eating for two," as the old saying goes. they only need a few more calories. but they do need to eat well. undernourished pregnant women have a higher risk of miscarrying, having premature or underweight infants and delivering babies with birth defects. i gained weight pretty rapidly, which i was surprised, because i was exercising very regularly and eating-- i eat very well balanced. so it just-- my body was getting ready on its own and my doctor said not to be concerned about that. i've done a lot of