This FACT indicates the number of women who smoked during pregnancy in each Australian state. Studies have shown that smoking while pregnant can decrease the amount of oxygen available to your child during the pregnancy, increase the chance of a miscarriage, increase the chance of a premature birth and can increase the risk of the baby being born with damage to its respiratory system. Nationally, 10.4 percent of women smoked during pregnancy. The data presented here reflects numbers for 2015. The state/territory with the highest number is New South Wales at 8,442 women smoking during pregnancy. The state/territory with the lowest is the Australian Capital Territory at 470.