Is there any effect if a pregnant woman inhales a small amount of secondhand smoke daily?

In general, it is harmful for pregnant women to inhale even small amounts of secondhand smoke daily, as it negatively affects the healthy development of the fetus. The detailed analysis is as follows:

Secondhand smoke refers to the smoke exhaled by smokers and includes numerous harmful substances such as nicotine, carbon monoxide, benzene, and others. When pregnant women inhale secondhand smoke, it may adversely affect fetal development. Toxins in secondhand smoke can enter the fetal body through the mother's bloodstream, potentially disrupting normal growth and development, and increasing the risk of birth complications such as preterm delivery and low birth weight. Furthermore, long-term exposure to secondhand smoke can also harm the health of the pregnant woman herself. Therefore, to minimize potential risks to both the fetus and the mother, pregnant women should avoid exposure to secondhand smoke as much as possible. It is recommended to avoid places where people smoke and to limit close contact with smokers.

If there are smokers in the home or workplace environment, appropriate measures should be taken—such as ensuring good ventilation and designating restricted smoking areas—to reduce potential harm to the pregnant woman and her fetus. Regular prenatal checkups are also important to ensure maternal and fetal health and safety during pregnancy.