Students in North Vancouver are being warned by police that eating sweets containing marijuana could give them far more than the munchies.

RCMP Cpl. Richard De Jong says that over the past week, several high school students in North Vancouver became sick from eating pot-infused dessert squares.

Krispy Square - Rice Krispies treat - marijuana

Police released this photo of a marijuana-containing dessert square that was seized after a number of North Vancouver high school students became ill. (North Vancouver RCMP)

Two Grade 10 students in particular became dizzy, had heart palpitations and vomited, and one of them had to be taken to hospital.

"More than two students took the product but only two got sick enough to either leave school or go to the hospital," he said.

De Jong said police believe the Rice Krispies squares and brownies were bought at Vancouver's 4/20 event, an annual celebration of cannabis culture held on April 20.

"They were selling them on school property, through word of mouth," he said. "The allure of these marijuana edibles, which taste and look like simple sweets, makes them especially risky."

Pot brownie - North Vancouver

Police also seized a number of pot brownies, and said they were likely purchased April 20th at the 4/20 rally in downtown Vancouver. (North Vancouver RCMP)

Mounties issued photos of the brownies wrapped in foil and the Rice Krispies squares wrapped in plastic affixed with a label listing the ingredients of cereal, marshmallow, vanilla and canna butter, which is made by boiling butter and marijuana.

"There's certainly no quality control and drugs in general are not guaranteed to be what they should be."

Police are working with school staff to educate students and parents to ensure such products don't end up at school, De Jong said.

"Think of the negative consequences of taking something when you don't know where it's been, how it's made or how you will respond to it."