Synthetic cannabinoids are far more potent and dangerous than natural cannabis, with 207 compounds identified in Europe | Research

The takeaway

Synthetic cannabinoids, sold as "Spice" or "K2," act as full receptor agonists making them much more potent than natural cannabis, with documented renal, respiratory, cardiovascular, and neurological toxicity including death.

Emergency physicians, substance use counselors, parents, anyone who might encounter synthetic cannabinoids

207 different synthetic cannabinoids identified in Europe since 2008

What the researchers found

207 synthetic cannabinoid compounds were identified by the EMCDDA from 2008 to 2020. As full CB receptor agonists, they are much more potent than natural cannabis (a partial agonist). Documented toxicity includes renal damage, respiratory depression, cardiovascular effects, hyperemesis, and neurotoxicity. Some have been classified as Schedule 1.

Why it matters

Synthetic cannabinoids are cheap, widely available, and often undetectable on standard drug tests. Their extreme potency compared to natural cannabis means users face far greater risks of acute toxicity and death.

The numbers in context

207 synthetic compounds identified by EMCDDA (2008-2020); 9 new compounds reported in latest period; sold as Spice, K2, Black Mamba, Bombay Blue; act as full agonists vs partial agonism of natural THC

How the study worked

Review of the development, abuse patterns, and toxicological effects of synthetic cannabinoids, drawing on EMCDDA surveillance data and clinical reports.

What this study cannot tell us

Review cannot cover all 207+ compounds in detail. Toxicity data varies by compound. Many adverse events likely go unreported. The rapid emergence of new analogues means the review may already be outdated.

How to read the evidence

Review based on EMCDDA surveillance data and clinical toxicology reports

When this study was published

Published in 2021. New synthetic cannabinoid compounds continue to emerge regularly.

The bigger picture

The rapid evolution of synthetic cannabinoids, with new analogues constantly created to evade regulation, represents one of the most dangerous developments in the recreational drug landscape.

Questions still open

Can regulation keep pace with the creation of new synthetic cannabinoid analogues? Would wider access to legal cannabis reduce demand for synthetics? What are the long-term effects of synthetic cannabinoid exposure?

Common questions

How are synthetic cannabinoids different from natural cannabis?

Natural THC is a partial agonist at CB receptors. Synthetic cannabinoids are full agonists, making them much more potent with higher risk of severe adverse effects including organ damage and death.

What are the dangers of synthetic cannabinoids?

Documented effects include renal toxicity, respiratory depression, cardiovascular problems, hyperemesis, and neurotoxicity. Over 207 different compounds have been identified, making them unpredictable and difficult to treat in overdose.

Read the original research

Pharmacological and Toxicological Effects of Phytocannabinoids and Recreational Synthetic Cannabinoids: Increasing Risk of Public Health.

Pharmaceuticals (Basel, Switzerland), 14(10)

View on PubMed ↗Publisher’s paper ↗

Citation

Bukke, Vidyasagar Naik; Archana, Moola; Villani, Rosanna; Serviddio, Gaetano; Cassano, Tommaso. (2021). Pharmacological and Toxicological Effects of Phytocannabinoids and Recreational Synthetic Cannabinoids: Increasing Risk of Public Health.. Pharmaceuticals (Basel, Switzerland), 14(10). https://doi.org/10.3390/ph14100965