Smoking before or during early pregnancy negatively affects the baby
the verdict
SUPPORTED
the evidence backs this
confidence 75/100
Substantial scientific literature supports the conclusion that maternal smoking before or during early pregnancy negatively affects the baby, leading to restricted fetal growth, epigenetic alterations, and long-term neurodevelopmental or behavioral issues.
Evidence for · 4
Placental Pathophysiology in Maternal Psychoactive Substance Use: Biological, Clinical, and Forensic Perspectives.
2026 · cited by 0
Paper 1 notes that tobacco and other psychoactive substances cross the placental barrier, disrupting development and increasing risks like intrauterine growth restriction.
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More for · 3
Environmental Exposure-Induced Epigenetic Modifications and Adverse Pregnancy Outcomes: A Systematic Review.
2026 · cited by 0
Paper 2 demonstrates through a systematic review that prenatal tobacco smoke exposure leads to epigenetic modifications linked to adverse pregnancy outcomes such as low birth weight and preterm birth.
The Consequences of Prenatal Tobacco Exposure: A Systematic Review of Birth Outcomes and Developmental Trajectories.
2026 · cited by 0
Paper 5 confirms via a systematic review that maternal smoking during pregnancy is consistently associated with reduced birth weight and adverse neurodevelopmental and psychiatric outcomes.
Maternal Early-Pregnancy Cardiovascular Health and Offspring Emotional, Behavioral, and Cognitive Outcomes in Adolescence.
2026 · cited by 0
Paper 6 includes smoking as part of early-pregnancy cardiovascular health, noting that suboptimal status increases the risk of emotional, behavioral, and cognitive problems in offspring.