In the video it shows how moms were asked about low birth weight of their baby. Out of 189 births 59 were low which gave a 31% chance that the babies birth weight could be low. Out of the 189 asked 74 of the moms smoked while pregnant which gave the probability that 40% of their babies would be born at a low birth weight. At the end of the video it shows how you can change up the question so instead of asking how many smoke you could ask who exercise, ate well, or drank while pregnant and the numbers will change dramatically. I think there are different factors that could be looked at when looking for a low birth weight like medical problems that mother may of had other than the smoking.