Study: More pregnant women are using marijuana

Pot smoking mamas?

There’s a bun in the oven and some moms to be are baking.

More pregnant women are using pot to ease nausea of morning sickness or heightened anxiety.

This according to a research letter published in the journal JAMA today. 

CNN reports that among pregnant teens, marijuana use climbed from 12.5% to 21.8% and among women 18 to 24, use climbed from 9.8% to 19% from 2009 to 2016.

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Marijuana legalization laws by state
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Marijuana legalization laws by state

Alabama: Medical use only, otherwise possession is a felony

(Photo: Dennis Macdonald via Getty Images)

Alaska: Marijuana legalized for medical and recreational use 

(Photo: Zoonar/N.Okhitin via Getty Images)

Arizona: Marijuana legalized for medical use

(Photo: Mikel Ortega via Getty Images)

Arkansas: Medical use only

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California: Legal for medical and recreational use

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Colorado: Legal for medical and recreational use  

(REUTERS/Rick Wilking)

Connecticut: Decriminalized and legalized for medical use 

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Delaware: Decriminalized

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Florida: Medical use only

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Georgia: Medical use only

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Hawaii: Medical use only

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Idaho: Not legal

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Illinois: Decriminalized

(Photo: VisionsofAmerica/Joe Sohm)

Indiana: Not legal

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Iowa: Medical use only

(Photo: Getty Images)

Kansas: Not legal

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Kentucky: Not legal

(Photo: Dorling Kindersley via Getty Images)

Louisiana: Medical use only

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Maine: Legal for medical and recreational use

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Maryland: Decriminalized

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Massachusetts: Legal

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Michigan: Medical use only

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Minnesota: Decriminalized

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Mississippi: Decriminalized on first offense

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Missouri: Not legal

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Montana: Medical use only

(Photo: Dennis Macdonald via Getty Images)

Nebraska: Decriminalized on first offense only

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Nevada: Legal

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New Hampshire: Medical use only

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New Jersey: Medical use only

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New Mexico: Medical use only

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New York: Decriminalized unless in public view

(REUTERS/Shannon Stapleton)

North Carolina: Decriminalized

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North Dakota: Medical use only

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Ohio: Decriminalized

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Oklahoma: Medical use only

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Oregon: Legal for medical and recreational use

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Pennsylvania: Medical use only

(Photo: Henryk Sadura via Getty Images)

Rhode Island: Decriminalized

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South Carolina: Not legal

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South Dakota: Not legal

(Photo: Dave and Les Jacobs via Getty Images)

Tennessee: Medical use only

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Texas: Medical use only, decriminalized in Houston and Dallas

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Utah: Not legal 

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Vermont: Decriminalized

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Virginia: Not legal

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Washington: Legal for medical and recreational use

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West Virginia: Medical use only

(Photo: Getty Images)

Wisconsin: Medical use only

(Photo: Getty Images)

Wyoming: Not legal 

(Photo: Space Images via Getty Images)

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The research covered certain women in California.

There was also a countrywide study.

That study asked women if they used pot within the last thirty days. That number grew from 2.37% in 2012 to 3.85% in 2014.

But doctors warn, marijuana use could be bad for a baby.

The health effects remain unclear, but according to the Centers for Disease Control and Prevention, effects could include low birth weight and developmental problems.

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