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Smoking Cessation clinical trials

The registry lists 1,581 studies for Smoking Cessation across more than 10 countries. 198 are recruiting or about to start. 928 of them are mainly about Smoking Cessation (how this is decided). Per ClinicalTrials.gov, last updated 2026-11-10.

ClinicalTrials.gov finds 2,117 studies for Smoking Cessation. How that becomes 1,581 here

This page counts the studies the registry files under Smoking Cessation, and those it files under no condition that list Smoking Cessationthemselves. Each study its search finds is placed by how the registry filed it and by the conditions it lists. ClinicalTrials.gov counts as of Nov 8, 2026. How condition pages count

  1. 2,117Found by its condition searchIt reads the conditions a study lists and their synonyms, and also titles and keywords.
  2. −2List Smoking Cessation as a condition, but the registry did not file them under itMost often written as “Smartphone App-based Smoking Cessation” (1) and “Smoking Cessation Financial Incentives” (1). The registry filed them under other conditions only, most often Cigarette Smoking (1) and Tobacco Use Cessation (1).
  3. −534Match it another way397 name it in the title, 10 in a keyword, and 127 by a synonym or other text the search reads.
  4. 1,581The count on this page12 of them list Smoking Cessation in their own words; the registry filed them under no condition.

Get an email when these change. Save the Smoking Cessation studies recruiting or about to start — once a week, free: studies that open, close, add sites or post results.

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Example · made-up studies

Breast cancer · Recruiting: 2 came in, 3 changed

What changed in your saved searches, Oct 31 – Nov 6:

A study of drug A after surgery for early breast cancer

Came in · now Recruiting

Drug B with hormone therapy in advanced breast cancer

Changed

· Sites: 4 added, including Seoul and Busan

· Enrollment: 300 → 450 participants

Exercise during chemotherapy

Now Active, not recruiting

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Status

Completed
1,117
Recruiting
137
Status unknown
107
Terminated
67
Active, not recruiting
50
Not yet recruiting
48

Phase

Phase 2
182
Phase 4
146
Phase 3
127
Phase 1
91
Early Phase 1
18

Where

United States
920
Canada
78
Hong Kong
59
China
51
France
48
United Kingdom
46

Who runs them

The University of Hong Kong (72) · Pfizer (43) · University of California, San Francisco (38) · University of Wisconsin, Madison (33) · Yale University (31) · Medical University of South Carolina (29) · Massachusetts General Hospital (27) · University of Oklahoma (26)

What is being tested here

Drugs under test in Smoking Cessation studies, those with the most open studies first. Medicines only given beside them are not counted. How drugs are counted

DrugOpenPhase 3All
Varenicline530110
Bupropion41548
Nicotine320110
Nicotine Patch3849
Cytisine3722
Naltrexone205
Bupropion Hydrochloride Controlled-release215
Nicotine Chewing Gum1314
Nicotine Lozenge108
Cycloserine114

Drug classes tested here GLP-1 receptor agonists 2 open · Opioid antagonists 2 open · Serotonin receptor agonists 1 open · MAO inhibitors (MAOIs) 3

Coming up

12phase 3 studies under way
94studies finish main data collection within a year3 of them phase 3

Studies recruiting or running, from their records. “Main data collection” ends at the primary completion date, the sponsor’s own estimate, which often moves.

The 10 nearest, phase 3 first

Who these studies take

Of the 137 Smoking Cessation studies recruiting now, 93 (68%) set no upper age limit and 37 (27%) stop at 75 or younger. 6 (4%) take children under 18. 8 (6%) are for women only and 1 (1%) for men only; 41 (30%) take healthy volunteers.

Recruiting studies that take each age, of 137
AgeWomenMen
103 (2%)3 (2%)
18113 (82%)106 (77%)
30121 (88%)114 (83%)
40121 (88%)114 (83%)
50126 (92%)121 (88%)
65122 (89%)117 (85%)
75105 (77%)99 (72%)
8597 (71%)91 (66%)

Across all 1,581 studies, recruiting or not: 35% stop at 75 or younger and 27% at 65; 8% take children; 6% are for women only and 2% for men only; 47% take healthy volunteers. From each study’s registry entry; the criteria on its page decide.

How long Smoking Cessation studies take

Of 56 phase 4 interventional studies under Smoking Cessation, half reached primary completion within 35 months of starting, counting those still running.

Start to primary completionEvery sponsorIndustryNon-industry
Phase 117 mo2–34 · 34 studies——
Phase 235 mo14–60 · 51 studies—41 mo17–61 · 42 studies
Phase 329 mo16–60 · 31 studies——
Phase 435 mo21–55 · 56 studies—35 mo24–55 · 53 studies
Interventional, no phase24 mo12–44 · 563 studies—24 mo12–45 · 546 studies
Observational31 mo17–90 · 47 studies—31 mo17–90 · 42 studies

Each figure is the month by which half the studies had reached primary completion, with the range in which the middle half did. Studies still running count until their last registry update; studies that stopped early are left out. Phase 1 includes early phase 1; observational means prospective or not stated, as retrospective and cross-sectional studies date a window of data rather than a study. How these figures are worked out

What changed recently

From the registry's own updates since Oct 13, 2026.

Started recruiting4

Results posted2

Newly registered9

Show 4 more

Studies

Recruiting first, then most recently updated. Showing 50 of 1,581. Browse all 1,581 → or search them.