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Gut bacteria may hold key to smoking cessation in addiction recovery

NCT ID NCT06803706

Knowledge-focused Sponsor: Sigmund Freud PrivatUniversitat 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at how stopping smoking for six weeks affects the body's chemistry and gut bacteria in people being treated for substance use disorders. Researchers will compare 100 participants who quit smoking with 50 healthy controls, using blood and stool samples along with psychological surveys. The goal is to find biological markers that could lead to better smoking cessation treatments for this group.

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 150 people

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

Started

May 2025

Expected to finish

Oct 2026

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 years and older

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: * diagnosis of a form of substance use disorder (F1x.x) by a licensed psychiatrist according to ICD-10 * minimum age of 18 years * sufficient knowledge of the German language * willingness to quit smoking * willingness and ability to consent Inclusion criteria for healthy controls : * minimum age of 18 years * sufficient knowledge of the German language * willingness and ability to consent Exclusion Criteria: * lack of consent, inability to provide informed consent * age below 18, * acute psychotic symptoms or acute suicidal tendencies * cardiovascular disease * pregnancy or breastfeeding * severe mental or organic illnesses (such as epilepsy, brain tumors, recent major surgery), tumor diseases, dementia (Mini Mental Score \<20), severe autoimmune diseases or immunosuppression, acute infections, or acute diarrhea, prior gastrointestinal surgery (except appendectomy) * probiotic intake within the last 6 months, * ongoing consumtion of dietary supplements, probiotics, antibiotics, or prebiotic supplements during the study * prior participation in a smoking cessation programme

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Conditions

The condition(s) this trial relates to.

alcohol abuse nicotine dependence Smoking Cessation substance-related disorder

As listed by the trial registrant

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

Alcohol use disorder (AUD) Healthy adult participants Nicotine addiction Substance use disorder (SUD)

How to take part

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

  1. The places running it

    3 sites. 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

    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

  • Grüner Kreis Organization Johnsdorf Facility

    RECRUITING

    Fehring, 8350, Austria

  • Medical University Graz

    RECRUITING

    Graz, 8036, Austria

  • Sigmund Freud Private University Vienna

    RECRUITING

    Vienna, 1020, Austria

More trials for these conditions

Other studies related to the condition(s) this trial covers.