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Socioeconomic status (SES) refers to an individual's or group's position within a hierarchical social structure. It is often measured by a combination of education, income, and occupation. SES can considerably influence various aspects of life, including health and education. In the context of expecting mothers, those from lower SES backgrounds may face numerous challenges and constraints that can indirectly affect their children's development.
For instance, limited financial resources can restrict access to quality healthcare, nutritious food, and educational materials—all of which are vital for early childhood development. Furthermore, low SES environments might expose children and parents to stressors like financial strain or unsafe living conditions.
Because these factors can materially affect a child's cognitive development, SES acts as a lurking variable that may contribute to the link between maternal smoking and lower IQ scores in children.

Educational background significantly influences family well-being and parenting practices. Mothers with higher educational attainment often have better knowledge about health and child development practices. They are typically more aware of the harmful effects of smoking during pregnancy and are more likely to refrain from it.
On the other hand, mothers with lower educational attainment may not have as much access to information or may not fully understand the long-term impacts of smoking. These mothers might also have fewer resources or opportunities for cognitive stimulation and enrichment activities for their children.

• This lack of exposure and stimulation can potentially contribute to lower cognitive outcomes in children.
• Because educational background shapes such a wide range of behaviors and attitudes, it can serve as another crucial lurking variable.

Parenting styles encompass the various approaches parents employ in raising their children. These styles can significantly influence a child's cognitive and emotional development. There are different parenting styles such as authoritative, authoritarian, permissive, and neglectful, each carrying its outcomes for child development.
Mothers who smoke may tend to have different parenting practices compared to non-smoking mothers. For example, they might exhibit more stress or less emotional availability, which could affect the child's cognitive and emotional growth. Moreover, the home environment in families where smoking is prevalent might not provide the optimal stimuli necessary for boosting a child's cognitive abilities.

• The variation in parenting styles and home environments serves as a lurking variable, influencing both the children's IQ scores and the initial relationship seen with maternal smoking.

Prenatal care is essential for monitoring the health and development of both the mother and her unborn child during pregnancy. Proper prenatal care involves regular check-ups, nutritional plans, and screenings for potential health issues; this ensures that fetal development is on track.
A lack of access to quality prenatal care can hinder these monitoring and preventive measures, potentially leading to complications that affect both the mother's and child's health. Women who smoke during pregnancy may also be less likely to seek or receive comprehensive prenatal care, due to various reasons related to lifestyle, economic, or educational barriers.
Thus, the absence of adequate prenatal care acts as an influential lurking variable, which might contribute to the observed discrepancies in children's IQ scores.