Halton and Niagara police are the latest to launch an educational campaign against synthetic marijuana.
It's sold in head-shops under the brand IZMS, but is also known as K2.
Police say it's made from a synthetic version of THC, the active ingredient in pot.
Health Canada says it's illegal and police say they are going to work with businesses that are selling it and have to taken off the shelves.
They're hoping to make an official announcement later this week.