Using Pot While Pregnant Not Tied to Birth Risks

Smoking marijuana during pregnancy doesn't appear to increase the risk of preterm birth or other harmful birth outcomes, a new review study suggests.

The researchers did initially find a link between smoking marijuana during pregnancy and an increased risk of having a preterm or low-birth-weight baby. But when they took into account whether the pregnant women also smoked tobacco in addition to marijuana, this increase in risk went away.

In other words, the risk of having either a preterm birth or a baby with a low birth weight was due to tobacco smoking, and marijuana use by itself was not linked to these outcomes, the researchers said.

The findings "do not imply that marijuana use during pregnancy should be encouraged or condoned," the researchers, from Washington University School of Medicine in St. Louis, wrote in the October issue of the journal Obstetrics & Gynecology. Rather, the lack of a link between marijuana use and harmful pregnancy outcomes suggests...

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