Stopping smoking during pregnancy: are we on the right track?

A systematic mapping review of the associations between pregnancy intentions and health-related lifestyle behaviours or psychological wellbeing

The aim of this study was to conduct a systematic mapping review of the literature that explored associations of pregnancy intentions with health-related lifestyle behaviours and psychological wellbeing before and during pregnancy. Six databases were searched (May 2017) for papers relating to pregnancy intentions, health-related lifestyle behaviours, and psychological wellbeing. The literature was mapped according to the preconception or pregnancy period; prospective or retrospective variable assessment; and reported lifestyle behaviours and psychological wellbeing outcomes. Of 19,430 retrieved records, 303 studies were eligible. Pregnancy intentions were considered during the preconception period in 103 studies (only 23 assessed prospectively), and during the pregnancy period in 208 studies (141 prospectively). Associations between pregnancy intention and preconception behaviours/psychological wellbeing were primarily reported for supplement use (n = 58) and were lacking for diet/exercise, and psychological factors. For behaviours/psychological wellbeing during pregnancy, associations with pregnancy intention were focused on prenatal care (n = 79), depression (n = 61), and smoking (n = 56) and were lacking for diet/exercise. Only 7 studies assessed pregnancy intentions with a validated tool. Despite a large body of literature, there were several methodological limitations identified, namely assessment of pregnancy intentions with non-validated measures and the reliance on retrospective assessment. Future primary studies are needed to fill gaps in our understanding regarding energy-balance-related behaviours. Future studies (including reviews/meta-analyses) should take care to address the noted limitations to provide a comprehensive and accurate understanding of the relationships between pregnancy intentions and health-related lifestyle behaviours and psychological wellbeing before and during pregnancy.

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Reliance on the assessment of pregnancy intentions with non-validated measures

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Reliance on retrospective assessment

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Studies on preconception pregnancy intentions and diet/exercise lacking

Social determinants of smoke exposure during pregnancy: Findings from waves 1 & 2 of the Population Assessment of Tobacco and Health (PATH) Study

Maternal smoking during pregnancy (MSDP) and secondhand smoke (SHS) exposure are associated with a myriad of negative health effects for both mother and child. However, less is known regarding social determinants for SHS exposure, which may differ from those of maternal smoking during pregnancy (MSDP). To identify social determinants for SHS exposure only, MSDP only, and MSDP and SHS exposure, data were obtained from all pregnant women (18-54 years; N = 726) in waves 1 and 2 of the Population Assessment of Tobacco and Health Study (2014-2015). Multiple logistic regressions were conducted using SAS 9.4. Smoke exposure during pregnancy was common; 23.0% reported SHS exposure only, 6.1% reported MSDP only, and 11.8% reported both SHS exposure and MSDP. Results demonstrate that relationships between smoke exposure during pregnancy and social determinants vary by type of exposure. Women at risk for any smoke exposure during pregnancy include those who are unmarried and allow the use of combustible tobacco products within the home. Those who are at higher risk for SHS exposure include those who are younger in age, and those who are earlier in their pregnancy. Those who are at higher risk for maternal smoking include those with fair/poor mental health status and those who believe that others' view tobacco use more positively. These results suggest the need for implementing more comprehensive policies that promote smoke-free environments. Implementing these strategies have the potential to improve maternal and fetal health outcomes associated with tobacco smoke exposure.

Fetal and neonatal exposure to nicotine leads to augmented hepatic and circulating triglycerides in adult male offspring due to increased expression of fatty acid synthase

While nicotine replacement therapy is assumed to be a safer alternative to smoking during pregnancy, the long-term consequences for the offspring remain elusive. Animal studies now suggest that maternal nicotine exposure during perinatal life leads to a wide range of adverse outcomes for the offspring including increased adiposity. The focus of this study was to investigate if nicotine exposure during pregnancy and lactation leads to alterations in hepatic triglyceride synthesis. Female Wistar rats were randomly assigned to receive daily subcutaneous injections of saline (vehicle) or nicotine bitartrate (1mg/kg/day) for two weeks prior to mating until weaning. At postnatal day 180 (PND 180), nicotine exposed offspring exhibited significantly elevated levels of circulating and hepatic triglycerides in the male offspring. This was concomitant with increased expression of fatty acid synthase (FAS), the critical hepatic enzyme in de novo triglyceride synthesis. Given that FAS is regulated by the nuclear receptor Liver X receptor (LXRα), we measured LXRα expression in both control and nicotine-exposed offspring. Nicotine exposure during pregnancy and lactation led to an increase in hepatic LXRα protein expression and enriched binding to the putative LXRE element on the FAS promoter in PND 180 male offspring. This was also associated with significantly enhanced acetylation of histone H3 [K9,14] surrounding the FAS promoter, a hallmark of chromatin activation. Collectively, these findings suggest that nicotine exposure during pregnancy and lactation leads to an increase in circulating and hepatic triglycerides long-term via changes in the transcriptional and epigenetic regulation of the hepatic lipogenic pathway.

The risk of adverse pregnancy outcomes is increased in preeclamptic women who smoke compared with nonpreeclamptic women who do not smoke

OBJECTIVE

Maternal smoking and preeclampsia independently increase the risk of adverse pregnancy outcomes; however, smoking decreases the risk of preeclampsia. We sought to estimate the risk of adverse pregnancy outcomes among preeclamptic women who smoke and hypothesized that this risk would be increased, compared with nonpreeclamptic women who smoke or preeclamptic women who do not smoke.

STUDY DESIGN

With the use of the Niday Perinatal Database and multiple logistic regressions, we estimated the risk of adverse pregnancy outcomes in nonpreeclamptic women who smoke, preeclamptic women who do not smoke, and preeclamptic women who smoke in relation to nonpreeclamptic women who do not smoke.

RESULTS

The incidence of adverse pregnancy outcomes was more than twice as high among preeclamptic women who smoke as among nonpreeclamptic women who do not smoke. The following data were observed: small-for-gestational-age infant (odds ratio [OR], 3.40; 95% CI, 2.27-4.89), preterm birth (OR, 5.77; 95% CI, 4.50-7.35), very preterm birth (OR, 5.44; 95% CI, 3.51-8.11), abruption (OR, 6.16; 95% CI, 3.05-11.01), Apgar <4 at 5 minutes (OR, 3.11; 95% CI, 1.48-5.72), and stillbirth (OR, 3.39; 95% CI, 1.33-6.99).

CONCLUSION

Smoking decreases the risk of preeclampsia, but smokers with preeclampsia have an increased risk for adverse pregnancy outcomes.

Prevalence of smoking during pregnancy and associated risk factors among Canadian women: a national survey

Background

Cigarette smoking carries a threat both to the expecting mother and her newborn. Data on the prevalence and predictors of smoking during pregnancy is limited in Canada. Canadian studies are mainly representative of specific cities and/or provinces. Therefore, the study aims to assess the prevalence of smoking during pregnancy and its associated risk factors throughout the Canadian provinces and territories.

Methods

The analysis was based on the Maternity Experience Survey targeting women aged ≥15 years who had singleton live births during 2005/06 in the Canadian provinces and territories. The outcome was ever smoking during the thirst trimester of pregnancy. Socio-economic factors, demographic factors, maternal characteristics, and pregnancy related factors that proved to be significant at the bivariate level were considered for a logistic regression analysis. Bootstrapping was performed to account for the complex sampling design.

Results

The sample size was 6,421 weighted to represent 76,508 Canadian women. The prevalence of smoking during pregnancy was 10.5%, whereby smoking mothers consumed on average 7 cigarettes a day (95% Confidence interval - CI: 6.5-7.4; SD = 5.7). Regression analysis revealed that mothers who smoked during pregnancy were more likely to be of low socio-economic status, non-immigrant, single and passive smokers during pregnancy. Not attending prenatal classes and experiencing stressful events before/during pregnancy also increased the mothers' odds of smoking during pregnancy. While the age of the mother's first pregnancy was negatively associated with smoking during pregnancy, the mother's current age was positively associated with it.

Conclusion

Smoking during pregnancy is still prevalent among Canadian women. The findings may be useful to enhance smoking prevention programs and integrated health promotion strategies to promote positive health behaviors among disadvantaged pregnancies.

Why do women continue to smoke in pregnancy?

Smoking during pregnancy not only impacts on the woman's health but that of her unborn child. Women most likely to continue smoking throughout pregnancy are generally of lower age, socio-economic status, level of education and occupational status. Women who continue to smoke during pregnancy often feel criticized by society. They feel guilt and personal conflict at not quitting. Lack of long-term positive outcomes from anti-smoking campaigns may result form ignorance surrounding socio-economically disadvantaged women's life circumstances. Current interventions often ignore the emotional and psychological stressors associated with pregnancy; they do not address the altered physiological processes that occur during pregnancy. A review of the literature pertaining to women who smoke throughout pregnancy is presented. Women want an individualised approach to smoking cessation advice, with health care workers having knowledge of the woman's social situation and viewpoints. This paper reveals that the woman's perspective has largely been ignored. Indeed health care professionals have attempted to manipulate women to stop smoking rather than engage in mutually respectful dialogue.

Social factors, psychopathology, and maternal smoking during pregnancy

We investigated the relative importance of sociodemographic factors and psychiatric disorders for smoking among 453 pregnant women in the National Epidemiological Survey on Alcohol and Related Conditions. Women with less than a high school education and those with current-year nicotine dependence had the highest risk of smoking (90.5%), compared with women with a college degree and without nicotine dependence (3.9%). More effective and accessible interventions for nicotine dependence among pregnant smokers are needed.

Perceived barriers to and benefits of attending a stop smoking course during pregnancy

OBJECTIVE

During pregnancy, the uptake of smoking cessation courses is very low. We assessed perceived barriers to and benefits of attending a cessation course during pregnancy.

METHODS

A decisional-balance questionnaire was devised, including 10 statements reflecting benefits of attending a cessation course and 10 statements of barriers to attendance. The questionnaire was delivered via the Internet and targeted pregnant smokers/recent ex-smokers. Participants completed the questionnaire on a single occasion, indicating their agreement with each statement.

RESULTS

Among 443 respondents, the most frequently endorsed barriers were 'Being afraid of disappointing myself if I failed' (54%) and not tending to seek help for this sort of thing (41%). The most frequently endorsed benefits were advice about cigarette cravings (74%) and praise and encouragement with quitting (71%). A greater interest in receiving help with quitting from a counselor was significantly associated with: being older, lower income, husband/partner advising cessation and less confidence in quitting.

CONCLUSION

Pregnant smokers perceive many benefits of smoking cessation courses. However, these women also perceive many barriers to attendance and studies are needed to evaluate interventions for overcoming such barriers.

PRACTICE IMPLICATIONS

Smoking cessation services need to address the perceived barriers to attending stop smoking courses during pregnancy, to publicise the benefits of these courses and to target women who feel that they cannot quit without this type of support.

Young women as smokers and nonsmokers: a qualitative social identity approach

The authors used a social identity perspective to explore young women's perceptions of smoking. They carried out 13 focus groups and 6 intercept interviews with women aged 16 to 28 years in regards to the social identities that might influence young women's smoking behavior. Three identities emerged: the cool smoker applied to the initiation of smoking; considerate smokers, who were older addicted smokers; and the actual and anticipated good mother identity, which applied to young women who quit smoking during pregnancy. These identities add to our understanding of the meaning of smoking within the lives of young women and might allow more focused initiatives with this group to prevent the progression to regular addicted smoking.

Predictors of smoking cessation during pregnancy among the women of Yamato and Ayase municipalities in Japan

Cigarette smoking during pregnancy affects the unborn fetus. This study aimed to investigate: (1) the smoking status of pregnant women before, during and after pregnancy in the Yamato and Ayase municipalities, Kanagawa, Japan; (2) the characteristics that differentiate successful spontaneous smoking quitters from continuous smokers during pregnancy; and (3) the awareness of risks of smoking that may influence smoking cessation during pregnancy. A community-based, cross-sectional survey of 420 postpartum women, who delivered their babies from July 2002 to October 2002, was performed. Out of 420 respondents, 275 (65.4%) did not smoke before and during pregnancy. Of the 145 women who smoked before pregnancy, 101 (69.3%) quit successfully while pregnant. Smoking prevalence during pregnancy was 10.4%. Out of 101 successful quitters during pregnancy, 22 (21.8%) women resumed smoking after childbirth. A multiple regression analysis showed that the independent predictors of smoking cessation during pregnancy were primiparous women and women living with non-smokers in the household. Although maternal age predicted smoking cessation in a simple regression analysis, this predictive value was lost in the multiple analysis. A simple analysis showed no significant association between the awareness of smoking risks and smoking cessation during pregnancy. It is suggested that Japanese smokers are more likely to quit while pregnant than women in other countries. In the future, smoking cessation programmes should be designed to help multiparous women and women living with smokers to give up smoking.

Consumo de tabaco durante el embarazo en España: análisis por años, comunidades autónomas y características maternas

BACKGROUND AND OBJECTIVE

The information about the convenience of non-smoking during pregnancy has increased in recent years. For this reason, we studied weather there has been any variation in smoking habits by pregnant women in Spain.

SUBJECTS AND METHOD

We used data from 31,056 mothers of infants without congenital defects, from all the Spanish Autonomic Regions. These data had been collected with the same methodology all over the country. The evolution of maternal smoking habit was analyzed by years, Autonomic Regions and maternal characteristics.

RESULTS

During the last years of the study (1995-2002), 30.31% of mothers smoked during pregnancy, with variations among different ethnic groups. It was observed a secular increase in the prevalence of smoker mothers from 1978 to 1991, which was further stable in about 27-28%. There was no secular decrease in the analyses by maternal age, number of cigarettes, and Autonomic Regions. Only smoker mothers with higher educational levels diminished smoking in 1993, with it being stable in about 23%. Mothers younger than 25 years were the heaviest smokers in all the years of the study. We confirmed a close relationship between tobacco, alcohol and illegal drugs consumption.

CONCLUSIONS

Our data indicate that the prevalence of women smoking during pregnancy has not diminished over the years or by Autonomic Regions, although 19.19% of smoker pregnant women quit smoking during the first months of pregnancy. Moreover, the heaviest smoker mothers were the youngest ones in all the years of the study. These results show the need to increase the information for women so that they quit smoking before pregnancy.

Prevalence of smoking associated with pregnancy in three Southern Ontario Health Units

OBJECTIVES

The objectives of this study were to determine the prevalence of pregnancy-associated smoking among women residing in three Southern Ontario Health Units and to examine potential risk factors for smoking during pregnancy, using an existing data collection mechanism.

METHODS

During May 2001, questions about pregnancy-associated smoking were asked during the telephone follow-up of postpartum women living in the three health units in Southern Ontario; this follow-up is routinely conducted by public health nurses. Sociodemographic data were also obtained. Data from 1,134 women were analyzed concerning smoking before and after the occurrence of the pregnancy was known, during each trimester, and immediately postpartum.

RESULTS

The rates of smoking before and after the pregnancy was known, in the first, second, and third trimesters, and immediately postpartum were 17.8%, 10.4%, 9.6%, 8.7%, 8.1%, and 7.9%, respectively. For all six estimates of smoking, Canadian-born women had rates 2.5 to 4 times higher than those of women born outside Canada. Age less than 25 years and lower educational attainment were also independent risk factors for smoking during pregnancy.

CONCLUSIONS

The Ontario Tobacco Strategy goal of eliminating smoking in pregnancy has not yet been realized. Ongoing smoking cessation programs among pregnant women are needed as part of a comprehensive strategy to reduce the overall prevalence of smoking. In planning such programs, particular attention should be paid to the needs of women who are Canadian-born, have lower educational attainment, and are under the age of 25.