Can you vape while pregnant?

No, it is not safe to use e-cigarettes during pregnancy.
Regardless of the reason, using any form of e-cigarette during pregnancy will pose clear and serious health risks to both the fetus and the mother.
Core Risk: Harm to the Fetus
Pregnancy-related use of e-cigarettes is closely associated with a variety of adverse pregnancy outcomes. This has been confirmed by authoritative medical institutions and numerous studies:
Specific harmful substances: Most e-cigarettes contain nicotine. This substance can permanently damage the developing brain and many other organs of the fetus. The World Health Organization (WHO) has also clearly stated that exposure to nicotine by pregnant women can have adverse effects on fetal development.
Confirmed adverse outcomes: Based on multiple systematic reviews and Meta-analyses (statistical methods that combine data from multiple high-quality studies), the use of e-cigarettes during pregnancy significantly increases the following risks:
Premature Birth: The risk increases by 1.67 to 1.95 times compared to non-smokers.
Low Birth Weight (LBW): The average birth weight of newborns may decrease by 57 grams, and the risk increases to 1.60 times.
Small for Gestational Age (SGA): This refers to infants whose birth weight is below the 10th percentile of the average weight for their gestational age. The risk increases to 1.73 times.
Not limited to nicotine: Even if you use an e-cigarette without nicotine, the fragrances, solvents, and other chemical substances in its e-liquid can still cause harm to you and your fetus. A study from Duke University also concluded that whether containing nicotine or not, e-cigarettes are "extremely toxic" to the fetus.
Summary and Recommendations
In conclusion, there is no safe level of e-cigarette use during pregnancy. Although compared to smoking traditional cigarettes, using e-cigarettes may expose the fetus to fewer toxins, any form of nicotine exposure is harmful.
If you are currently smoking or using e-cigarettes, quitting smoking is the best way to give your baby a healthy start. Please communicate with your prenatal doctor immediately and seek professional help and resources for quitting smoking.