I found out on AddictionResource that any addiction can be a health hazard for women but using substances or smoke during pregnancy brings many risks for the unborn baby as well. Drugs, especially opioids and stimulants can increase the risk of miscarriage, cause seizures, and high blood pressure. After birth, many babies will suffer from neonatal abstinence syndrome (NAS). The complications might start with sever newborn’s withdrawal symptoms, and continue during their development when they experience learning problems and behavioral disorders.
Fortunately, many pregnant women are seeking help for their addiction. This is important and should be actively encouraged because a pregnant woman shouldn’t stop using substances suddenly or without professional help.