The destructive drug is often made with chemicals such as weed killer and fly spray, both of which can cause life-threatening reactions.
The video was posted to Facebook and received dozens of comments within the first few hours.
"Come on bros what a waste of life i used to manufacture this stuff and the shit i used to put in this stuff could make paint come off of a house when it was legal people used to look for the strongest hit and i had it," one Facebook user wrote.
"It sent people to the hospital but they were back the next day. Yous guys just need to give it up seen to much deaths already please think bout your family because the man making money off yous dont give a f**** about you at all. Make him rich while you or your family dies," the person added.
What is synthetic cannabis?
Synthetic cannabis is manufactured by spraying a chemical mixture onto finely chopped plant material, which is then left to dry before packaging. ESR said that because there was no quality control in the process there could be big variations in which chemicals, and how much of them, was present.
Synthetic cannabinoids are themselves likely to be harmful. The chemicals are so new that their medical effects are unknown, or only anecdotal.
The synthetic compounds are much stronger than the cannabis plant. One synthetic cannabinoid, AMB-Fubinaca, is reported to be 75 times more powerful than the THC in cannabis plants.
The drugs could also be contaminated. Eastern Districts Police said sellers have admitted to adding kitchen spray cleaner, rat poison, and horse tranquiliser.
