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Maternal pot use under microscope in Colorado

FILE - In this Jan. 5, 2015 file photo, Ali Maffey, retail marijuana education manager for the Colorado Department of Health and Environment, talks to reporters after a news conference to announce the rollout of the $5.7-million, state-sponsored advertising campaign to educate marijuana consumers in Denver. The "Good to Know" advertisements will focus on marijuana laws and health effects, including the ban on use in public places, age restrictions, DUI laws, the dangers of overuse and other concerns related to the use of the products. A legislative bill is facing its first hearing on Tuesday, Feb. 3, that proposes pot shops post signs warning of the risks that maternal marijuana use poses to unborn children. (AP Photo/David Zalubowski, File)
FILE - In this Jan. 5, 2015 file photo, Ali Maffey, retail marijuana education manager for the Colorado Department of Health and Environment, talks to reporters after a news conference to announce the rollout of the $5.7-million, state-sponsored advertising campaign to educate marijuana consumers in Denver. The "Good to Know" advertisements will focus on marijuana laws and health effects, including the ban on use in public places, age restrictions, DUI laws, the dangers of overuse and other concerns related to the use of the products. A legislative bill is facing its first hearing on Tuesday, Feb. 3, that proposes pot shops post signs warning of the risks that maternal marijuana use poses to unborn children. (AP Photo/David Zalubowski, File) FILE - In this Jan. 5, 2015 file photo, Ali Maffey, retail marijuana education manager for the Colorado Department of Health and Environment, talks to reporters after a news conference to announce the rollout of the $5.7-million, state-sponsored advertising campaign to educate marijuana consumers in Denver. The "Good to Know" advertisements will focus on marijuana laws and health effects, including the ban on use in public places, age restrictions, DUI laws, the dangers of overuse and other concerns related to the use of the products. A legislative bill is facing its first hearing on Tuesday, Feb. 3, that proposes pot shops post signs warning of the risks that maternal marijuana use poses to unborn children. (AP Photo/David Zalubowski, File)

DENVER (AP) – Marijuana use by pregnant or nursing women might seem like a no-brainer of a bad idea, but a proposal in Colorado to step up such warnings is raising concern because of limited or inconclusive research on the dangers.

Pot users in Colorado and Washington already receive warnings that the drug shouldn’t be used by pregnant and nursing women. But a Colorado bill facing its first hearing Tuesday proposes going further by requiring pot shops to post signs saying that maternal marijuana use poses risks to unborn children.

“It’s important to have notification that there is risk,” said Republican Rep. Jack Tate, sponsor of the bill.

The proposal is controversial. Some pregnant women use marijuana to ease nausea, and a marijuana industry group fears the warnings don’t acknowledge limited research on pot use by mothers-to-be.

Tyler Henson, president of the Colorado Cannabis Chamber of Commerce, called the proposal “another attempt to discredit and ignore the popular public opinion of marijuana’s medicinal use.”