A group of New Mexico elementary school students got more than a sugar high after one fifth-grade student mistakenly shared a box of medical marijuana edibles at school.

A 9-year-old girl came to school with what looked like typical gummy candies, but were actually edibles laced with THC, one of the psychoactive chemicals found in cannabis, according to Ebubekir Orsun, the principal at the Albuquerque School of Excellence.

Officials at the school only learned of the mix-up, which happened earlier this month, after the student went to the school nurse feeling sick and complaining of dizziness.

Kristi Del Curto, the school’s dean of elementary students, told the Albuquerque Journal reports that officials took the labeled package out of the trash, “and as soon as we looked at it, we said, ‘Nope, that is not candy.’”

The candies reportedly belonged to the student’s grandfather. Neither she, nor the three other students who ate them, had lasting symptoms, though some of the students did get “giggly,” according to the Journal.

School representatives posted a reminder for students and parents on Facebook last Thursday.

“We would like our community to be alert with drugs and any edibles that may or could be in different formats,” the post reads. “We kindly ask our parents and community members not to talk explicitly about drugs/medicine when students are present (unintentionally to tempt or encourage students to use drugs).”

With medical marijuana now permitted in 29 states, including New Mexico, and recreational marijuana legal in an additional eight, a number of public health officials have voiced concerns about children accidentally ingesting edibles, particularly those packaged as kid-friendly treats such as candy, brownies and cookies.

The Colorado Department of Public Health and Environment argued that edibles put young children at risk of accidental poisoning, and noted that calls to poison control centers and visits to Colorado pediatric hospitals related to marijuana poisoning increased after medical marijuana became readily available. “These findings suggest that greater availability of marijuana, particularly in edible products, can increase risks to young children,” they wrote in a 2015 perspective piece published in the New England Journal of Medicine.

Get The Brief. Sign up to receive the top stories you need to know right now. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Write to Jamie Ducharme at jamie.ducharme@time.com.