_____ is/are implicated in 25 percent of all low-birthweight births worldwide.

Name: _____ is/are implicated in 25 percent of all low-birthweight births worldwide.
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Tobacco use is a known risk factor for low-birthweight births, accounting for 25 percent of such cases worldwide. The use of nicotine constricts blood flow to the placenta, reducing the amount of oxygen and nutrients the fetus receives, which can result in low birth weight.

_____ Is/are Implicated in 25 Percent of All Low-Birthweight Births