The Department of Health Services put out a warning about synthetic cannabinoids that could be deadly.
Fake marijuana, K2 and spices are products that could be laced with fatal chemicals including rat poison.
"It thins your blood, it makes you bleed to death," Dr. Larry Gordon from Aspirus said.
Wisconsin lawmakers outlawed them nearly a decade ago.
The DHS report released Thursday said 15 cases of people being hospitalized due to these cannibinoids have been documented in Wisconsin. Seven of those cases are confirmed, the other eight are being investigated.
"They’re multiple chemicals all mixed together, sprayed on a plant-like material so unfortunately the user thinks they’re getting an effect similar to marijuana but it’s not," Lt. Melinda Pauls of the Wausau Police Department said.
The Wausau Police Department said it hasn’t seen cannabinoids back in central Wisconsin – but there are cases in Dane, Milwaukee and Outagamie counties.
The only way to know if someone in your house is using it, is to watch for the symptoms.
"They increase their pulse, and their blood pressure, and their body temperature, they cause anxiety, paranoia," Pauls said. "Just things you normally wouldn’t expect for somebody who thinks they were going to smoke marijuana."
Police don’t know of anyone who has died in Wisconsin this year but in Illinois, four deaths have been reported as of Wednesday.