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Secondhand cannabis smoke: what gets into your body?

NCT ID NCT06030674

Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at how secondhand cannabis smoke affects healthy nonsmokers. Researchers will measure cannabis byproducts in urine before and after exposure in public places. The goal is to understand how much of the smoke's chemicals enter the body. This is a small pilot study with 200 participants.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
secondhand cannabis smoke exposure
What this could lead to
If successful, this could help understand how secondhand cannabis smoke enters the body and inform public health guidelines.
What could go wrong
This is a small, early pilot study with only 200 healthy nonsmokers, so results may not apply to everyone. The exposure happens in real-world settings, making it hard to control all factors.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 200 people

The number the study aims to enrol. It can still change while the study runs.

Started

Sep 2023

Expected to finish

Jun 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

21 to 50 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: \- Adult nonsmokers, aged 21-50, who: * Are healthy on the basis of medical history * Have systolic blood pressure \<150 * Have diastolic blood pressure \<100 * Have BMI between 18.1 and 34.9 * Able to perform moderate exercise, * Are not exposed to tobacco or cannabis SHS in their daily lives. (Nonsmoking status and low SHS exposure are determined by self-report on the screening questionnaire, salivary cotinine \< 10 ng/ml and THC \< 50 ng/m and exhaled CO2 below 4 ppm) Exclusion Criteria: * Current use of cannabis products, including CBD and edible THC products * Regular exposure to secondhand tobacco or cannabis smoke * Positive SARS-CoV-2 antibody test * Age 18 \< or \> 50 * Physician diagnosis of asthma, heart disease, hypertension, thyroid disease, diabetes, renal or liver impairment or glaucoma. * Unstable psychiatric condition (such as current major depression, history of schizophrenia or bipolar disorder) or current use of more than two psychiatric medications * Systolic blood pressure \> 150 * Diastolic blood pressure \> 100 * Pregnancy or breastfeeding (by urine hCG and/or history) * Alcohol or illicit drug dependence within the past 5 years * BMI \> 35 and \< 18 * Current illicit drug use (by history or urine test) * More than 1 pack year smoking history * Ever a daily marijuana smoker * Smoked anything within the last 2 months * Occupational exposure to smoke, dusts OR fumes * Concurrent participation in another clinical trial * Unable to communicate in English * No social security number

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Healthy

How to take part

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  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

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Contacts and locations

Locations

  • Zuckerberg San Francisco General Hospital

    RECRUITING

    San Francisco, California, 94110, United States

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