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E-Cig coolants may boost appeal – study investigates

NCT ID NCT05932745

Knowledge-focused Sponsor: Yale University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 cooling ingredients like WS-3 and menthol in e-cigarettes affect how much people like them and find them addictive. Researchers will have 66 adult e-cigarette users try different e-liquid mixtures and report their feelings of liking, craving, and harshness. The goal is to understand which components make e-cigarettes more appealing, which could guide future regulations.

What this could mean

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

Active substance
E-liquid coolants (WS-3, WS-23, menthol)
What this could lead to
If successful, this study could help understand which e-cigarette ingredients make them more appealing or addictive, potentially informing future regulations.
What could go wrong
This is a small, early-stage study (66 participants) measuring subjective responses, not health outcomes. Results may not apply to all users or predict long-term addiction risk.

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 66 people

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

Started

Jun 2025

Expected to finish

Aug 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

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * 18 years or older * Able to read and write * Some current e-cigarette use * Urine cotinine ≥200ng/ml * Willing to abstain from tobacco/nicotine use 2 hours prior to sessions Exclusion Criteria: * Current use of non-prescription substances besides nicotine, marijuana, alcohol * Any significant current medical or psychiatric condition * Known hypersensitivity to propylene glycol * Pregnant or lactating females * Uncontrolled asthma * Nut/e-liquid flavorant allergy * Current marijuana (tetrahydrocannabinol) vaping + E-cigarette or vaping use Associated Lung Injury (EVALI) symptoms * Dislike of menthol flavor

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Conditions

The condition(s) this trial relates to.

nicotine dependence Vaping

As listed by the trial registrant

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

Nicotine use disorder

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

    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

  • JB Pierce Lab

    RECRUITING

    New Haven, Connecticut, 06519, United States

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