Two cases of severe opioid toxicity in Australia were traced to THC vape products containing protonitazene, a potent synthetic opioid, with one case resulting in death.
Cannabis vape users, emergency physicians, toxicologists, and drug policy advocates
One death from protonitazene-contaminated THC vape product
What the researchers found
Two young males experienced opioid toxicity after using what they believed were THC vape products. Case 1 suffered repeated respiratory arrest requiring ventilation but survived. Case 2 died. Analysis of the vaping device found in the deceased's hand revealed a mixture of protonitazene and THC. Protonitazene is a benzimidazole opioid that can be dissolved and vaped due to its lipophilicity.
Why it matters
This represents a new and dangerous intersection of the illicit drug markets: potent synthetic opioids being mixed into cannabis vape products. Users have no way to know their THC vape contains a potentially lethal opioid, and the vaping route can deliver high concentrations rapidly.
The numbers in context
Case 1: blood protonitazene 0.74 ug/L, survived with ventilation. Case 2: postmortem protonitazene 0.33 ug/L and THC 2 ug/L, died. Product analysis confirmed protonitazene-THC mixture in vape device.
How the study worked
Two-case clinical report from Australian hospitals. Toxicological analysis included blood concentrations of protonitazene and THC. Product analysis of the vaping device and e-liquid confirmed contamination.
What this study cannot tell us
Only two cases reported; the prevalence of protonitazene-contaminated cannabis vapes in Australia is unknown. Cannot determine whether the contamination was intentional adulteration or cross-contamination during production.
How to read the evidence
Two confirmed cases with analytical toxicology; documents a real threat but cannot estimate prevalence.
When this study was published
2024 case report
The bigger picture
The contamination of cannabis products with synthetic opioids has been reported in North America with fentanyl, but protonitazene represents a newer threat. The vaping route, which may appear safer than injection, can still deliver lethal opioid doses rapidly.
Questions still open
- How widespread is synthetic opioid contamination of cannabis vape products? Should cannabis vape users carry naloxone? Would regulated cannabis markets eliminate this contamination risk?
Common questions
Can THC vape products contain deadly opioids?
What is protonitazene?
Read the original research
Protonitazene detection in two cases of opioid toxicity following the use of tetrahydrocannabinol vape products in Australia.
Clinical toxicology (Philadelphia, Pa.), 62(8), 539-541
Citation
Syrjanen, Rebekka; Schumann, Jennifer L; Castle, Jared W; Sharp, Lesley; Griffiths, Andrew; Blakey, Karen; Dutch, Martin; Maplesden, Jacqueline; Greene, Shaun L. (2024). Protonitazene detection in two cases of opioid toxicity following the use of tetrahydrocannabinol vape products in Australia.. Clinical toxicology (Philadelphia, Pa.), 62(8), 539-541. https://doi.org/10.1080/15563650.2024.2383692
Explore the wider topic
- Surviving 4/20 Sober: A Practical Survival Guide
- CBT for Cannabis Recovery: How Cognitive Behavioral Therapy Works
- THC Purity and Potency: What the Label Actually Means
- The Cannabis Relapse Cycle: Quit, Feel Good, Get Complacent, Repeat
- Cold Turkey vs Tapering: Which Way to Quit Weed
- Dab and Concentrate Withdrawal: Why It Hits Harder
- Dating Sober After Years of Being High: What Nobody Tells You
- Delta-8 THC: Addiction, Withdrawal, and What We Don't Know
- Edible Addiction and Withdrawal: What Makes It Different
- Edibles and Psychosis: When a Bad Trip Becomes an Emergency
- Exercise as Medicine: Working Out After Quitting Weed
- Grieving Weed Itself: Mourning the Loss of a Companion
- Vaping vs Smoking vs Edibles: A Harm Reduction Guide
- How to Help Someone Quit Weed (When They're Not Ready)
- How Cannabis Products Are Made: From Plant to Concentrate to Edible
- How to Quit Weed: A No-Judgment Step by Step Guide
- Journaling Through Weed Withdrawal: Why Writing Helps You Heal
- Laced Weed and Contaminated Vapes: Real Risks vs Myths
- Legal vs Street Weed: Quality, Safety, and What You're Actually Smoking
- MA vs SMART Recovery vs Therapy: Comparing Your Options
- Meditation and Mindfulness for Weed Withdrawal
- Your Partner Still Smokes Weed: How to Navigate It
- Quitting Weed While Your Partner Still Smokes
- The Pink Cloud Effect: When Quitting Weed Feels Too Good
- How to Quit Smoking Weed Cold Turkey: What to Expect
- Quit Weed or Cut Back: Which Is Right for You?
- I Quit Weed and Regret It: An Honest Look at Non-Linear Recovery
- Quitting Weed Pens and Dabs: Why Concentrates Hit Different
- Quitting Edibles: Is Withdrawal Different from Smoking?
- Quitting Weed in Your 20s: Career, Social Life, Starting Over
- Quitting Weed in Your 30s: It's Not Too Late
- Quitting Weed After 10+ Years of Daily Use: What to Expect
- Quitting Weed During a Life Crisis: Divorce, Job Loss, and Other Bad Timing
- Quitting Weed and Working Out: How Exercise Helps Recovery
- Quitting Weed After Loss: When Grief Comes Flooding Back
- Quitting Weed When It's Legal Everywhere
- Weed Withdrawal Success Stories: Real People Who Made It Through
- Quitting Weed Long Distance: When You Can't Remove Triggers
- I Relapsed on Weed. Now What? A Practical Reset Guide
- I Relapsed After Quitting Weed: What Now?
- Sativa vs Indica: The Myth and the Science Behind Cannabis Strain Labels
- Should I Quit Weed? A Decision Framework (Not a Lecture)
- Quitting Weed at Music Festivals and Concerts: A Sober Survival Guide
- Supplements That Actually Help with Weed Withdrawal (And Ones That Don't)
- How to Tell Your Friends You're Quitting Weed
- Why Is Weed Withdrawal Worse Now Than 20 Years Ago?
- Relapse Prevention Plan for Cannabis: A CBT-Based Approach
- Why Weed Relapse Happens: The Science Behind Going Back
- Replacing the Ritual: What to Do When You Quit Weed
- How Cannabis Damaged My Relationships: Before and After
- Social Media Detox from Weed Content