Please select the eligibility criteria that correspond to the clinical trial below.
Title: Varenicline for the Treatment of Smokeless Tobacco Use
Brief Summary: Varenicline (Chantix™, Pfizer) is a novel selective nicotinic receptor partial agonist with specificity for the α4β2 nicotine acetylcholine receptor that has demonstrated remarkable efficacy for increasing long-term tobacco abstinence rates in cigarette smokers. The novel mechanism of action of varenicline potentially circumvents the limitations of using nicotine replacement therapy or bupropion pharmacotherapy in ST users. The overall goal of this line of research is to develop effective pharmacologic treatments for ST users to increase long-term (≥ 6 months) abstinence rates. The central hypothesis of this application is that varenicline is efficacious for the treatment of ST users.


Options:
A: Inclusion Criteria:

Subjects will be eligible to participate if they:

1. Are at least 18 years of age
2. Have used ST daily for the past 12 months (regular user)
3. Identify ST as their primary tobacco product
4. Are in general good health (determined by medical history and screening physical examination)
5. Has provided written informed consent to participate
6. Are able to participate in all aspects of the study

Exclusion Criteria:

Individuals will be excluded from study participation if they:

1. Are currently (in previous 30 days) using other behavioral or pharmacologic tobacco cessation programs (i.e., behavioral therapy, nicotine replacement therapy, clonidine, bupropion SR, or doxepin)
2. Have self-reported current, untreated depression or a Beck Depression Inventory (BDI-II) Score of ≥ 20
3. Have, as defined by the C-SSRS (Columbia-Suicide Severity Rating Scale);current non-specific suicidal thoughts, or have a lifetime history of a suicidal attempt (defined as "potentially self-injurious act committed with at least some wish to die, as a result of act.")
4. History of psychosis or bipolar disorder
5. Are currently pregnant or lactating or is of childbearing potential and not willing to use any form of contraception
6. Have another member of their household already participating in this study
7. Are allergic to varenicline
8. Describe having a medical history of:

   * Unstable angina
   * Myocardial infarction within the past 3 months
   * Cardiac dysrhythmia other than medication-controlled atrial fibrillation or PSVT
   * Medically-treated or untreated hypertension with BP ≥ 200 systolic OR ≥ 100 diastolic
   * Have other medical or psychiatric conditions that would exclude the participant
B: Inclusion Criteria:

* Diagnosed with schizophrenia or schizo-affective disorder
* Smokes between 20 and 50 cigarettes per day
* Moderate to high nicotine dependence score
* Interest in quitting smoking

Exclusion Criteria:

* Currently trying to quit smoking
* Seizure disorder or lowered seizure threshold due to anorexia, bulimia, head trauma, diabetes with insulin, or hypoglycemics
* Alcohol or drug use disorders
* Requires certain medications
* Pregnant or breastfeeding
C: Inclusion Criteria:

A software program using Anatomical Therapeutical Chemical (ATC) prescription codes and International Classification of Primary Care (ICPC) diagnosis codes selected potential patients with COPD. Criteria: age \>35 years and a diagnosis recorded as COPD or as ICPC code R95/96, or a prescription of at least three times of bronchodilators (ATC code R03a/bc) and/or prescription of at least two times of inhaled anti-inflammatory medication in the past year (ATC code R03). General practitioners (GPs) had to confirm the diagnosis of the selection. Patients were eligible to participate if they met the following criteria:

* Current smoking
* Suffering from COPD according to the GP's diagnosis
* In command of the Dutch language.

Exclusion Criteria:

* Too ill
* Under control of a chest physician
* Serious physical or psychological comorbidity
D: Inclusion Criteria:

* Cigarette smokers who call the New York State Smokers' Quitline requesting assistance with quitting smoking
* State that they are under the care of a primary care physician
* Are eligible for receipt of pharmacotherapy by mail using the standard NRT criteria
* Speak English
* Answer "no" to the following 3 questions:

  * "Have you ever been diagnosed with or treated for a mental health problem like major depression, bipolar disorder, dysthymia, or schizoaffective disorder?"
  * "Have you ever had serious thoughts of killing or hurting yourself, ever have any intention or plan to carry out these thoughts, or actually attempted to kill yourself?"
  * "Is there any reason that you cannot use varenicline/Chantix?"

Exclusion Criteria:

* State that they are not under the care of a primary care physician
* Are not eligible for receipt of pharmacotherapy by mail using the standard NRT criteria
* Do not speak English
* Answer "yes" to the question, "have you ever been diagnosed with or treated for a mental health problem like major depression, bipolar disorder, dysthymia, or schizoaffective disorder?"
* Answer "yes" to the question, "have you ever had serious thoughts of killing or hurting yourself, ever have any intention or plan to carry out these thoughts, or actually attempted to kill yourself?"
* Answer "yes" to the question, "is there any reason that you cannot use varenicline/Chantix?"
* Are women who are currently pregnant
* Report that they are unwilling to receive or take varenicline on screening

Answer: A