What effects do different drugs have on a human fetus?
Some legal drugs can have a more detrimental effect than illicit substances. Alcohol use during pregnancy can cause facial dysmorphic features, developmental delay and mental impairment, according to PubMed Central. Tobacco use can cause decreased birth weight and a higher instance of sudden infant death syndrome.
Sources: ncbi.nlm.nih.gov, ncbi.nlm.nih.gov