A national marijuana industry group launched the first food safety basics course in Colorado on Wednesday for producers and retailers of pot-infused edibles, and another for so-called budtenders who work in the state’s legal weed stores.

Colorado and Washington this year became the first U.S. states to allow recreational sales of the drug to adults. Voters in Oregon and Alaska will consider similar ballot initiatives in the fall.

One of the biggest challenges for state regulators has been the market for marijuana-laced edibles such as candies, cookies, drinks and chocolates, which could put ill-educated buyers at risk of accidentally ingesting too much.

Last week a Colorado task force unveiled proposed new rules to limit potency levels, and on Wednesday the National Cannabis Industry Association launched its first Food Safety Basics course specifically for marijuana industry professionals.

Read more: U.S. marijuana industry group launches first food safety course | Reuters