05/09/2014 06:48 EDT | Updated 05/09/2014 06:59 EDT

Students Use E-Cigarettes To Smoke Marijuana.. While At School

Daryl Cura demonstrates an e-cigarette at Vape store in Chicago, Wednesday, April 23, 2014. The federal government wants to ban sales of electronic cigarettes to minors and require approval for new products and health warning labels under regulations being proposed by the Food and Drug Administration. (AP Photo/Nam Y. Huh)

Leave it to teenagers to figure this one out.

Edmonton's Public and Catholic school boards are cracking down on e-cigarettes after they discovered five incidents in the past two weeks where students were using the devices to smoke marijuana.

And despite the amount of students getting caught, it's not so easy to detect, say police. Students replace the "juice" in the e-cigarettes with marijuana oil — a process which essentially eliminates the odour of the drug.

The information that we're seeing is that it's prevalent, it's everywhere," Sgt. Kelly Rosnau, with EPS' School Resource Unit, told The Edmonton Sun.

"Kids are jumping on this very quickly."

Staff Sgt. Pierre Blais told the Edmonton Journal the method is "discreet" because it produces no odour and that some students are doing drugs "in a brazen manner."

According to The Edmonton Sun, marijuana oil can contain a THC level as high as 90 per cent — compared to the 10 to 20 per cent THC levels typically found in rolled joints.

There is also concern about the process under which marijuana oil is made.

Rosnau told CBC News marijuana oil production uses significant amount of highly flammable chemicals that could lead to explosion.

Both the Edmonton Catholic School District and Edmonton Public Schools will ban on e-cigarettes for both students and staff on school property.

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