Can Breath Tests Detect THC After Eating Cannabis Edibles?
THC showed up in breath after eating cannabis edibles, but patterns varied widely between people and timing was unpredictable.
Quick Facts
What This Study Found
19 of 29 participants showed a THC concentration peak in breath at 47, 92, or 180 minutes after eating a cannabis edible, while 6 had their highest reading before ingestion and 4 showed no significant change.
Key Numbers
19 of 29 participants peaked at 47, 92, or 180 min; 6 had highest THC before ingestion; 4 showed no change; 5 additional cannabinoids detected; CBD trends sometimes diverged from THC trends
How They Did This
29 participants ate cannabis edibles and provided breath samples at baseline plus three post-ingestion timepoints using one of two sampling devices. Five cannabinoids beyond THC were also measured.
Why This Research Matters
Breath-based cannabis testing is being explored as a roadside impairment tool, but almost all prior research focused on smoked cannabis. This is the first study examining whether edibles produce detectable breath THC changes, which is critical since edible use is growing.
The Bigger Picture
As cannabis edibles become more popular, law enforcement and workplace testing may need different detection approaches than those designed for smoked cannabis. Breath testing for edibles appears feasible but far from reliable.
What This Study Doesn't Tell Us
Small sample (29 participants), only three post-ingestion timepoints over 180 minutes, most participants had THC in pre-use breath samples suggesting prior use, only one edible dose tested
Questions This Raises
- ?Why do some people show no breath THC increase after edible ingestion?
- ?Would a longer sampling window reveal delayed peaks?
- ?Can breath testing reliably distinguish recent edible use from prior smoked cannabis use?
Trust & Context
- Key Stat:
- 19 of 29 participants showed a breath THC peak within 180 minutes of eating an edible
- Evidence Grade:
- Small proof-of-concept study with only 29 participants and limited timepoints; first study of its kind for edibles
- Study Age:
- Published 2025
- Original Title:
- The detection of cannabinoids in breath after ingestion of cannabis-infused edibles.
- Published In:
- Journal of analytical toxicology, 49(9), 673-680 (2025)
- Authors:
- Bery, Jennifer L, Brooks-Russell, Ashley(20), Lovestead, Tara M(3), Jeerage, Kavita M
- Database ID:
- RTHC-06058
Evidence Hierarchy
A small preliminary study to test whether a larger study is feasible.
What do these levels mean? →Frequently Asked Questions
Can a breath test tell if you ate a cannabis edible?
In this study, most participants showed THC increases in breath after eating edibles, but the timing ranged from 47 to 180 minutes and some showed no change at all.
How is breath testing for edibles different from testing for smoked cannabis?
After smoking, breath THC spikes quickly and predictably. After edibles, the response was much more variable, with some people peaking nearly 3 hours later and others showing no measurable change.
Read More on RethinkTHC
- THC-purity-potency-label-meaning
- dab-concentrate-addiction-withdrawal
- delta-8-addiction-withdrawal
- edible-addiction-withdrawal-different
- edibles-psychosis-emergency-room
- healthiest-way-to-consume-cannabis
- how-cannabis-products-made-concentrates-edibles
- laced-weed-fentanyl-contaminated-vape
- legal-weed-vs-street-weed-quality-safety
- quitting-dabs-withdrawal
- quitting-edibles-withdrawal
- sativa-vs-indica-difference-myth
- weed-potency-withdrawal
- thc-drinks-vs-edibles-body-processes
- homemade-vs-store-bought-edibles-safety
- how-to-store-edibles-shelf-life-potency
- cannabis-dosing-guide-how-much-thc
- what-is-tincture-different-from-edible
- how-to-avoid-greening-out-dosing-prevention
Cite This Study
https://rethinkthc.com/research/RTHC-06058APA
Bery, Jennifer L; Brooks-Russell, Ashley; Lovestead, Tara M; Jeerage, Kavita M. (2025). The detection of cannabinoids in breath after ingestion of cannabis-infused edibles.. Journal of analytical toxicology, 49(9), 673-680. https://doi.org/10.1093/jat/bkaf063
MLA
Bery, Jennifer L, et al. "The detection of cannabinoids in breath after ingestion of cannabis-infused edibles.." Journal of analytical toxicology, 2025. https://doi.org/10.1093/jat/bkaf063
RethinkTHC
RethinkTHC Research Database. "The detection of cannabinoids in breath after ingestion of c..." RTHC-06058. Retrieved from https://rethinkthc.com/research/bery-2025-the-detection-of-cannabinoids
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.