Kuala Lampur, June 2 -- KUALA LUMPUR, June 2 - The National Anti-Drug Agency (Nada) has announced that it will begin deploying specialised testing kits nationwide this month, targeting fentanyl and synthetic cannabinoids.

Nada director-general Datuk Ruslin Jusoh noted that many users locally believe they are consuming psilocybin - the compound found in so-called magic mushrooms - when they are actually inhaling synthetic cannabinoids.

The two are not the same, and the health consequences differ significantly. Here is what they are and what they do.

Firstly, what is fentanyl?

Fentanyl is a synthetic opioid - meaning it is made entirely in a laboratory - originally developed for medical use in treating severe or chronic pain, typically ...