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Can a short tobacco break curb cannabis cravings?

NCT ID NCT03766971

Disease control Sponsor: New York State Psychiatric Institute Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 01, 2026 · Last updated Sep 02, 2026 · Updated 1 time

Summary

This trial tests whether quitting tobacco for 7 days or 21 days changes how much cannabis people choose to smoke. Adults aged 18 to 60 who use both cannabis and tobacco will be randomly assigned to one of two tobacco cessation periods. Researchers will then measure how many cannabis cigarettes participants choose to smoke, to see if the length of tobacco abstinence affects cannabis relapse.

What this could mean

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

Active substance
Tobacco cessation (behavioral) and cannabis (drug)
What this could lead to
If quitting tobacco for a short period reduces cannabis relapse, it could point to a simple, practical way to help dual users cut back on cannabis.
What could go wrong
This is an early-stage lab study with a small number of participants, so results may not apply to everyone. Quitting tobacco can cause withdrawal symptoms, and the effect on cannabis use may not last.

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

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 160 people

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

Started

Feb 2020

Expected to finish

Nov 2028

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

18 to 60 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: * Males and non-pregnant females aged 18-60 years old * Use cannabis * Smoke tobacco cigarettes * Medically and psychologically healthy Exclusion Criteria: * Regular drug use other than cannabis * Current pregnancy/lactation

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Conditions

The condition(s) this trial relates to.

nicotine dependence Tobacco Use

As listed by the trial registrant

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

Cannabis use Tobacco use

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

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

  2. The official record

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • New York State Psychiatric Institute

    New York, New York, 10032, United States

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