Methadone users who are pregnant are at risk of premature labor or having a miscarriage if they abruptly stop using the drug, and many women choose to continue using methadone throughout their pregnancy to minimize these risks.
Heroin withdrawal is not fatal for healthy adults, but can be fatal to the fetus of a pregnant addict.
The visual distortions produced by LSD are often referred to as "pseudo-hallucinations" because people are aware that what they are seeing is not real due to the effects of the drug.
U.S. rates for Fetal Alcohol Syndrome range from 1 to 3 per 1,000.