| Withdrawn | Persistence of Oral DNA Adducts in Smokers and Vapers NCT06983392 | University of Minnesota | N/A |
| Completed | Isometric Versus Isotonic Trunk Muscle Strength Training on Lung Function in Heavy Smokers NCT07241624 | MTI University | N/A |
| Completed | Acute IMT Intensity Effects in Male Smokers NCT07200895 | FATMA DİLARA AKAR ÇAMYAR | N/A |
| Recruiting | A Study of Exercise and Pharmacologic Intervention on Systemic Inflammation NCT07058974 | Icahn School of Medicine at Mount Sinai | Phase 1 |
| Recruiting | Evaluation Of The Efficacy Of Subgingival Application Of Lovastatin Gel As An Adjunct To Non-Surgical Treatmen NCT07282756 | Medical University of Silesia | N/A |
| Completed | CAT Score and Airway Limitation in Adult Smokers NCT06644456 | Muğla Sıtkı Koçman University | — |
| Completed | Effects of Mental Practice and Therapeutic Exercise in Mild Smokers NCT06123598 | University of Valencia | N/A |
| Active Not Recruiting | Immediate Effects of Mental Practice and Therapeutic Exercise in Mild Smokers NCT06108323 | University of Valencia | N/A |
| Completed | Effect of Exercise on Smokers NCT06805968 | Istanbul Medipol University Hospital | N/A |
| Completed | Effect of Tobacco Use on the Health of the Newborn up to 24 Months. NCT07427706 | Institut Investigacio Sanitaria Pere Virgili | — |
| Unknown | Evaluation of a Workplace Smoking Cessation Program in Hong Kong (Phase VI) NCT05758272 | The University of Hong Kong | N/A |
| Completed | Effect of Smoking on Retinal Vessel Morphology and Functionality NCT07261176 | IRCCS San Raffaele | N/A |
| Recruiting | Incident Chronic Obstructive pulmoNary dIsease Cohort Study (ICONIC) NCT04252781 | Assistance Publique - Hôpitaux de Paris | N/A |
| Unknown | Oral Mucosal Lesions Among Smokers in an Egyptian Population Study. NCT03299634 | Cairo University | — |
| Completed | Oral Mucosal Lesions Among Smokers in an Egyptian Population. NCT03299595 | Cairo University | — |
| Completed | Prefatory Study to Explore Changes in Nasal Mucociliary Clearance and to Standardize Nasal Scraping Procedure NCT03086707 | Philip Morris Products S.A. | N/A |
| Completed | Multiple Breath Washout (MBW) Using Sulfur Hexafluoride Reference Values and Influence of Anthropometric Param NCT04099225 | Universitätsmedizin Mannheim | — |
| Completed | Repair, Remodeling and Regeneration of the Bronchial Epithelium of COPD Patients NCT02354677 | University Hospital, Montpellier | N/A |
| Completed | Nicotine Patch Safety Study NCT01655082 | Pierre Fabre Medicament | Phase 2 |
| Completed | Smoker Extracellular Vesicles Influence on Human Bronchial Epithelial Cells NCT03608293 | Lille Catholic University | N/A |
| Completed | Novel Endpoints in Cough Challenge Testing NCT01566968 | Manchester University NHS Foundation Trust | — |
| Completed | Cognitive Behaviour Therapy and Nicotine Replacement to Increase Tobacco Cessation NCT01734330 | Hospital do Coracao | N/A |
| Completed | Effect of Behavioral Training on Physiological Responses to Smoking Cues, Affect and Cortisol NCT01362101 | A. Eden Evins | Phase 4 |
| Terminated | Impact of Current Smoking in the Tolerance of Bronchoscopy NCT01345383 | Centre Hospitalier Universitaire Saint Pierre | — |
| Completed | Effect of Whole Body Periodic Acceleration on Airway Endothelial Function NCT01213706 | University of Miami | N/A |
| Completed | Improving Medication Compliance and Smoking Cessation Treatment Outcomes for African American Smokers NCT00781599 | Nikki Nollen, PhD, MA | N/A |
| Withdrawn | D-Cycloserine Enhancement of Exposure-Based CBT for Smoking Cessation (DCSSmoking) NCT00827281 | Boston University Charles River Campus | Phase 2 |
| Completed | Study to Evaluate the Efficacy, Safety, Tolerability and Immunogenicity of 100µg NIC002 Vaccine in Cigarette S NCT00736047 | Novartis | Phase 2 |
| Completed | Evaluation of Cardiovascular Effects of Smoking Cessation in HIV Patients NCT00918073 | The University of Texas Health Science Center, Houston | — |
| Completed | Smoking Relapse Prevention in Schizophrenia NCT00320697 | North Suffolk Mental Health Association | Phase 4 |
| Completed | 4 mg Nicotine Polacrilex Gum and Swedish Portion Snus NCT01182129 | Contract Research Organization el AB | Phase 1 / Phase 2 |
| Completed | Differences in the Presentation Outcome and Response to Treatment Between Never- Smokers and Smokers With NSCL NCT00483015 | Washington University School of Medicine | — |
| Completed | Metabolism of Nicotine and Cotinine in Pregnant African-American Women NCT00341640 | Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) | Phase 1 |
| Completed | Efficacy and Safety of Nicotine-Qbeta Vaccine in Smokers NCT00369616 | Cytos Biotechnology AG | Phase 2 |