SNPwatch gives you the latest news about research linking various traits and conditions to individual genetic variations. These studies are exciting because they offer a glimpse into how genetics may affect our bodies and health; but in most cases, more work is needed before this research can provide information of value to individuals. For that reason it is important to remember that like all information we provide, the studies we describe in SNPwatch are for research and educational purposes only. SNPwatch is not intended to be a substitute for professional medical advice; you should always seek the advice of your physician or other appropriate healthcare professional with any questions you may have regarding diagnosis, cure, treatment or prevention of any disease or other medical condition.Human Molecular Genetics, suggests that the effect of this variation is strong enough to overcome the maternal instinct and social pressure to protect one’s unborn child from the harmful effects of cigarette smoke.British researchers studied 2,474 women who smoked regularly before becoming pregnant. When questioned about smoking during their first trimester, 31% of the women with two Gs at had kicked the habit, compared to only 21% of the women with two As. During the third trimester, 47% of women with two Gs were smoke-free, while only 34% of women with two As were.Overall, after adjusting for pre-pregnancy smoking quantity, the researchers calculated that each A at increases a woman’s odds of continuing to smoke throughout her pregnancy by about 1.2 times.The authors say their results show how genes can influence what is perceived by many to be a matter of self-control, but that “it’s in my genes” shouldn’t used as an excuse to avoid giving up smoking during pregnancy.