The acid-catalyzed conversion of CBD to delta-8 THC produces numerous untested byproducts that are sold to consumers without quality control, with EVALI cases and a ~2% fatality rate reported in California.
Read this if you use delta-8 THC products or want to understand the safety concerns around hemp-derived synthetic cannabinoids.
~2% fatalityEVALI fatality rate approaching 2% in California, linked to vaping products including delta-8
What the researchers found
The review provides what the authors believe is the first comprehensive listing of all documented byproducts from the acid-catalyzed ring closure of CBD to delta-8 THC. Quality control in the delta-8 industry is totally inadequate. Consumers are ingesting mislabeled products containing compounds that have never received toxicological testing. The synthetic chemistry is complex and poorly controlled, producing delta-8, delta-10, HHC, and numerous other isomerized byproducts. EVALI cases continue to be reported, with a fatality rate approaching 2% in California.
Why it matters
The 2018 Farm Bill inadvertently created a loophole allowing hemp-derived delta-8 THC products. This review reveals the chemical complexity and safety concerns of a rapidly growing unregulated market affecting millions of consumers.
The numbers in context
- First comprehensive listing of ACRCC-delta-8 THC byproducts
- EVALI fatality rate approaching 2% in California
- Products include delta-8, delta-10, HHC, and numerous isomers
- No human toxicological evaluation for most byproducts
- Quality control described as "totally inadequate"
How the study worked
Literature review of ACRCC-delta-8 THC chemistry, quality control issues, byproduct identification, and regulatory concerns. Compilation of documented conversion byproducts.
Who was studied
Review of delta-8 THC product chemistry and safety (general consumer concern)
What this study cannot tell us
Review article, not original research. EVALI attribution to delta-8 products specifically is not fully established. The byproduct listing may not be exhaustive as new compounds continue to be identified.
How to read the evidence
Comprehensive chemistry review with safety concern documentation. Authoritative on the chemical issues but EVALI attributions are less definitive.
When this study was published
Published in 2023. Addresses an active and growing consumer safety crisis.
The bigger picture
Delta-8 THC represents a failure of cannabis regulation — a synthetic product sold as "natural hemp" through a legal loophole, with unknown safety profiles and documented harm. This review should inform urgent regulatory action.
Questions still open
- Should delta-8 THC be regulated the same as delta-9 THC?
- Can the conversion process be controlled to eliminate toxic byproducts?
- How many EVALI cases are attributable to delta-8 products specifically?
Read the original research
The Dark Side of Cannabidiol: The Unanticipated Social and Clinical Implications of Synthetic Δ8-THC.
Cannabis and cannabinoid research, 8(2), 270-282
Citation
Geci, Michael; Scialdone, Mark; Tishler, Jordan. (2023). The Dark Side of Cannabidiol: The Unanticipated Social and Clinical Implications of Synthetic Δ8-THC.. Cannabis and cannabinoid research, 8(2), 270-282. https://doi.org/10.1089/can.2022.0126