Federal health officials warn of the possibility of “mass THC intoxication events” from food, in a report that explored how at least 85 people were sickened last year after eating at a restaurant that mistakenly used THC-infused oil to prepare dough.

The report, which was released on Thursday by the Centers for Disease Control and Prevention, documented cases that surfaced after patrons ate at the restaurant, Famous Yeti’s Pizza, in Stoughton, Wis.

THC, or tetrahydrocannabinol, is a psychoactive ingredient found in many cannabis products.

From Oct. 22 to Oct. 24 last year, dozens of people, up to 91 years old, experienced symptoms that included dizziness, sleepiness and anxiety, after eating pizza, garlic bread, cheese bread and sandwiches at Famous Yeti’s, the C.D.C. said.

The restaurant is in a building that shares a commercial kitchen with other businesses, including a state-licensed vendor that makes edible THC products.

An investigation began after local emergency services reported to public health officials on Oct. 24 that seven people were transported to a hospital for dizziness, sleepiness and anxiety since Oct. 22, according to the C.D.C.

All seven people had eaten at the same restaurant, the report said.

Carbon monoxide tests at the restaurant, as well as at the homes of two people who experienced symptoms, were negative, according to the C.D.C. report. All seven people were treated in an emergency department for THC intoxication, the C.D.C. said.