Cigarette smoke contains many ingredients.However,only two of these are able to pass through the placenta to the fetus.They are

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Nicotine and carbon monoxide are the two ingredients in cigarette smoke that are able to pass through the placenta to the fetus. This can lead to numerous negative health effects for the developing baby, including reduced oxygen supply, low birth weight, and increased risk of sudden infant death syndrome (SIDS). Hydrocarbons, while also harmful, are not able to pass through the placenta as easily.

Cigarette Smoke Contains Many Ingredients