This systematic review and meta-analysis examines how nicotine exposure during pregnancy influences early cognitive development in offspring. Drawing on both human and animal studies, the research focuses on postnatal outcomes during the earliest stages of life, particularly before six months of age. It highlights how nicotine, which readily crosses the placenta and affects the developing brain, may disrupt critical neurodevelopmental processes and lead to measurable differences in cognition, behaviour, and early neurological functioning.
Three Key Takeaways
- Early brain development is vulnerable to nicotine exposure
Nicotine interferes with key neurodevelopmental processes, such as cell growth, differentiation, and neural signalling,during critical periods of fetal development, which can have lasting impacts after birth. - Strongest evidence of impact is seen in reflex development
Across studies, the most consistent and significant finding was delayed or impaired reflex development in infants and animal offspring exposed to nicotine prenatally. This suggests early disruptions in the central nervous system and may signal broader developmental concerns. - Cognitive effects are emerging but human research is limited
While animal studies show clear negative impacts on areas like spatial memory and exploratory behaviour, there is a notable lack of human research. This gap makes it difficult to draw definitive conclusions but highlights the need for caution and further study, especially given rising use of e-cigarettes and nicotine replacement products during pregnancy.