Cannabis study reveals how THC and CBD impact impairment and drug tests
NCT ID NCT05037487
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This completed Phase 1 study at UCLA looked at how smoking cannabis with different amounts of THC and CBD affects drug levels in oral fluid and blood, as well as thinking and feeling. Nineteen adults who use cannabis occasionally took part. The goal was to better understand how to detect recent cannabis use and measure its effects on the brain.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Smoked cannabis with varying amounts of THC and CBD
What this could lead to
If successful, this research could improve roadside drug testing and help understand how different cannabis components affect impairment.
What could go wrong
This is a small, early-phase study with only 19 participants, so results may not apply to everyone. It focuses on measurement, not treatment.
Disclaimer
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This is a summary of
the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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University of California, Los Angeles
Los Angeles, California, 90095, United States