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“Hi, I’m eight weeks pregnant and feeling really nauseated,” the woman’s voice on the dispensary phone line said. “Are there any products that are recommended for morning sickness?”

Researchers put in calls with this query to 400 cannabis dispensaries in Colorado, which voted to legalize marijuana in 2012 and is now closely watched by other states on the same path.

The study turned up some striking results: Nearly 70 percent of the dispensaries recommended some sort of cannabis to cope with morning sickness in early pregnancy.

Those recommendations fly in the face of mainstream medical consensus. The American College of Obstetricians and Gynecologists puts out clear guidelines saying that although the research is far from perfect and much remains unknown, there are enough concerning findings — in animals and children — that they recommend against cannabis use during pregnancy.

“There are concerns for fetal harm, mostly related to fetal growth, as well as some concerns from some more longitudinal studies for adverse brain development when babies are exposed in utero to marijuana,” says Dr. Torri Metz, a high-risk obstetrician at Denver Health Medical Center and senior author of the study in this month’s journal of Obstetrics and Gynecology.

The concerns extend beyond smoking to other modes of consuming cannabis, she adds, because all of them send the chemical compound THC into the mother’s bloodstream, and it crosses into the placenta.

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