Please select the eligibility criteria that correspond to the clinical trial below.
Title: Phase II Randomized, Double-Blind Trial of Bupropion Versus Bupropion + Naltrexone for Smoking Cessation
Brief Summary: The purpose of this study is to compare the effects of bupropion + placebo to bupropion + naltrexone as treatments to help smokers quit.


Options:
A: Inclusion Criteria:

* 18 years and older.
* Smoked at least 10 cigarettes/day for at least 1 year.
* English speaking.
* Females who are of childbearing potential must practice effective contraception and meet the following criteria:
* Are instructed to avoid pregnancy through 30 days after the last dose of study medication.
* Have a negative urine pregnancy test at baseline.
* Agree to use of the birth control methods listed: an oral contraceptive agent, an intrauterine device (IUD), an implantable contraceptive (e.g., Norplant), or an injectable contraceptive (e.g., Depo-Provera) for at least one month prior to entering the study and will continue its use through at least 30 days after the last dose of the study medication. A barrier method of contraception (e.g., condom or diaphragm with spermicide) while participating in the study and 30 days after the last dose of study medication.
* Willingness to reduce alcohol consumption during study to 2 or fewer standard drinks/day (3 oz. of alcohol or two beers (12 oz.), or two 5 oz. glasses of wine).
* Willingness to not use illicit drugs during study period including marijuana.

Exclusion Criteria:

* Concurrent use of tobacco products (other than cigarettes) or nicotine products.
* Contraindications to use of bupropion (i.e., concurrent use of other forms of bupropion, MAO inhibitors, anti-depressant medication, seizure disorder or any clinical situation that might increase risk for seizures, past head injury, current or prior diagnosis of bulimia or anorexia nervosa; bipolar disorder).
* Contraindications to use of naltrexone (i.e., past history of opioid abuse or dependence or evidence of opioid use in the past 30 days; significant hepatocellular injury as evidenced by liver enzyme levels over 3 times normal limits).
* Use of medications whose metabolism or effects may be adversely altered by bupropion or naltrexone. Medications that contraindicate the use of bupropion include theophylline, procarbazine, carbimazole, nialamide, pargyline, toloxatone, iproniazid, and systemic steroids. Medications that contraindicate the use of naltrexone include opioid analgesics and yohimbine.
* Current use of anti-seizure medications, disulfiram, or any medications that significantly challenge liver functioning.
* Treatment for drug or alcohol dependence during the last year, or evidence of alcohol abuse so severe that the patient is judged potentially unable to comply with the protocol.
* Evidence of problem alcohol consumption based on AUDIT.
* Self-reported use of illicit drugs in the past 90 days (including opioids, but excluding marijuana).
* Suicidal or homicidal ideation.
* Current major depression.
* History of bipolar disorder.
* Recent (within twelve months) myocardial infarction.
* Pregnant or lactating or planning pregnancy during treatment period.
* Having plans to leave the immediate geographical area within 9 months.
* Unwillingness or inability to given written informed consent.
B: Inclusion Criteria:

* Long-term, daily NRT users (except nicotine patch) (\>11 months) ex-smokers that are willing to try to stop the use of NRT and adhere to this protocol.
* More than 4 pieces of nicotine gum/ sublingual tablets/ lozenges/ per day, OR more than 3 inhaler cylinders per day, OR
* more than 10 puffs of nasal spray per day.

Exclusion Criteria:

* Age \< 18 years,
* CO Smokers,
* Pregnant and lactating women,
* Used varenicline before,
* Not able to cooperate,
* Other significant diseases that might influence the trial (such as moderate -severe cardiac disease, lung cancer,) in expired air \> 7 ppm.
C: Inclusion Criteria:

1. Age: 18-65 years old
2. Smoking: \>/= 5 cigarettes per day within the 2 months preceding the screening visit and expired CO greater than or equal to 6 ppm.
3. Able to follow verbal and written instructions in English and complete all aspects of the study
4. Have an address and home telephone number where they may be reached
5. Provide informed consent and agree to all assessments and study procedures
6. Be the only participant in their household

Exclusion Criteria:

1. Within the month immediately preceding the screening visit; use of any form of tobacco product other than cigarettes on 3 or more days within a week only if the individual refuses to refrain from non-cigarette tobacco use during the course of this study
2. Within the month immediately preceding the screening visit; use of marijuana in any form on 3 or more days within a week
3. Within the two weeks immediately preceding the screening visit, involvement on more than 3 days in any formal smoking cessation activities
4. Current visual or auditory problems that in the opinion of the investigator would interfere with the completion of study assessments
5. Treatment on a continuous basis within 2 weeks before the screening visit: any contraindicated medication for Varenicline or Bupropion.
6. Uncontrolled hypertension or other major contraindications for Bupropion or Varenicline.
7. Severe renal impairment (CR Clearance \<30 ml/min/1.73 m2).
8. Laboratory evaluations outside normal limits and of potential clinical significance in the opinion of the investigator
9. Meet current criteria for psychiatric disorders or substance abuse as assessed by the MINI for items A, B, D, I, J, K, L, M and N, including a past manic or hypomanic episode as well as a lifetime psychotic disorder.
10. Subject rated as moderate to high on suicidality as assessed by the MINI.
11. Psychiatric hospitalization within 1 year of screening date.
12. A positive urine pregnancy test during the screening period. Women who are two years post menopausal, one year post-tubal ligation, or who have had a partial or full hysterectomy will not be subject to a urine pregnancy test.
13. Pregnant, breast-feeding, or of childbearing potential who is not protected by a medically acceptable, effective method of birth control while enrolled in the study
14. Use of Varenicline or Bupropion within two weeks before the screening visit.
15. History of hypersensitivity or allergic reaction to Varenicline, tricyclic antidepressant, Bupropion (Wellbutrin, Zyban) or similar chemical classes or any component of these formulations.
16. Subject considered by the investigator as unsuitable candidate for receipt of an investigational drug, or unstable to be followed up throughout the entire duration of the study.
D: Inclusion Criteria:

* Smokers aged 18 years or above and wanting to stop smoking
* Smokers who have smoked an average of at least 10 cigarettes per day over the last 4 weeks
* Smokers who have tried before to stop smoking at least once with varenicline, and who took varenicline for at least 2 weeks
* The last attempt to stop smoking must be at least 3 months before entering the study

Exclusion Criteria:

* Individuals who have not tolerated varenicline well previously, or who have a current or prior medical or psychiatric history that would make entry into the trial inadvisable
* Individuals who have previously participated in clinical trials of varenicline
* Individuals who have been participating in another smoking cessation trial within the last 3 months, or other drug trial within the last 30 days

Answer: A