You have to want to change.

Although many smokers cut back on smoking or quit during pregnancy a substantial minority do not intend to stop permanently, according to a study of 642 German women who gave birth in 2002 and 2003. (1) All of the women smoked before becoming pregnant, but in a survey conducted 4-6 weeks after they delivered, six in 10 reported having quit during pregnancy: Only about half said that they' currently smoked, and these women reported smoking less postpartum than before they had become pregnant. However, close to four in 10 of all women who provided relevant information indicated no intention to quit smoking. First-time mothers smoked less and had less urge to smoke than others, but the groups did not differ with respect to quitting, smoking postpartum or intention to quit. The researchers conclude that although first-time mothers may be "more aware of social expectations with regard to smoking" during pregnancy, all pregnant women need smoking cessation interventions.

(1.) Handel G et al., Intention to change smoking in pregnant and postpartum women according to number of pregnancies , Eurpean Journal of Public Health. 2009, 19(2):218-221.

FYI is compiled and written by Dore Hollander, executive editor of Perspectives on Sexual and Reproductive Health.