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Hidden gas, hidden effects: CO's surprising link to pain and anxiety

NCT ID NCT07571941

Knowledge-focused Sponsor: Izmir Democracy University 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 low levels of carbon monoxide (CO) from smoking or the environment affect pain, senses, anxiety, and depression. Researchers will measure CO in the breath of 70 healthy adults and test their pain threshold and mood. The goal is to better understand CO's subtle effects on the body and mind.

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.

Participants

About 70 people

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

Expected to start

Jun 2026

An estimate. Start dates often move.

Expected to finish

Sep 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.

Who is studied

This study will include healthy adult participants aged 18-65 years with a history of regular smoking for at least the past 6 months. Participants will be free of respiratory, cardiovascular, neurological, and psychiatric diseases, and will not have any acute infection or recent surgery affecting respiratory muscles.

Ages

18 to 65 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: * Being between the ages of 18 and 65 Having a regular smoking history for the past 6 months No history of respiratory, cardiovascular, or neurological/psychiatric diseases No recent surgery or trauma that could affect respiratory muscles Not having an acute infection (especially upper or lower respiratory tract infection) Exclusion Criteria: \- Having chronic respiratory diseases such as COPD or asthma Having a history of cardiovascular disease Having a diagnosed neurological or psychiatric disorder Having a history of surgery or trauma affecting respiratory muscles within the last 3 months Being pregnant or having a suspicion of pregnancy

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Conditions

The condition(s) this trial relates to.

anxiety disorder Depression Smoking Tobacco Smoking

As listed by the trial registrant

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

Carbon monoxide, pain perception, sensory thresholds, anxiety, depression, tobacco smoking

How to take part

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

  1. 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 ↗

  2. 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.