1. The harm of second-hand smoke to pregnant women 2. The consequences of second-hand smoke for pregnant women 3. How to protect pregnant women from second-hand smoke 4. How society should deal with the problem of second-hand smoke for pregnant women 1. The harm of second-hand smoke to pregnant women 1. Second-hand smoke Secondhand smoke refers to the smoke exhaled around smokers, which contains a large number of harmful substances, such as benzene, carbon monoxide, nicotine, etc. These substances can affect the health of pregnant women and their fetuses. 2. Affects fetal development. Long-term exposure to second-hand smoke will cause insufficient oxygen supply in the body of pregnant women and affect fetal development. At the same time, harmful substances such as benzene will also pass through