Pizza accidentally laced with THC – the main psychoactive ingredient in marijuana – has apparently made dozens of people sick in Wisconsin.

Health officials in Dane County say Famous Yeti's Pizza in Stoughton, about 20 miles (32 km) southeast of Madison, served pizza contaminated with THC Monday through Thursday.

Paramedics alerted health authorities Thursday that they had transported five people who said they became ill after eating pizza at the restaurant.

Health officials said they have received dozens of reports of people getting sick from the pizza and are still taking reports. A full accounting will be available in a final report, they said.

Officials said a restaurant cook ran out of oil, went into a shared kitchen in the same building and accidentally picked up a jug of oil from a shelf that contained delta-9, a form of THC.

Marijuana is illegal in Wisconsin, but products like THC from the hemp plant are legal. Health officials said the oil in question could be used to make cookies and spices.

THC-related symptoms may include dizziness, increased blood pressure, vomiting, anxiety, paranoia, and hallucinations.

Cale Ryan, co-owner of Famous Yeti's Pizza, told the Wisconsin State Journal that the chef simply used the wrong oil. He said a batch of dough that could be used to make 60 pizzas was contaminated. He said he had heard from about 20 affected customers.

“You get really stoned,” he said. “You get high from the THC, so I find feeling like that more worrying than anything else. It’s basically eating something edible, but without knowing it.”