Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Twelve-Week, Double-Blind, Placebo-Controlled, Multicenter Study With Follow-up Evaluating the Safety and Efficacy of Varenicline Tartrate 1 MG BID for Smoking Cessation
Brief Summary: The primary purpose of this study is to evaluate the safety and efficacy of varenicline given for a twelve week treatment period in comparison with placebo for smoking cessation.


Options:
A: Inclusion Criteria:

* Smoke \>4 cigarettes/day for at least 6 months
* Age 21+
* Want to quit and ready to try in next 30 days
* Willing to quit all forms of tobacco (including e-cigs)
* Willing to use Chantix to try to quit
* Have a cell phone able to receive text messages
* Willing to attend 3 visits and use varenicline for smoking cessation
* Plan to live in local area for next 6 months
* Read and write in English
* Women not pregnant and taking steps to avoid
* Able to understand and willing to sign consent

Exclusion Criteria:

* History of allergic reaction or other adverse event while using varenicline
* Used a smoking cessation aid/medicine in past 1 month (including e-cigs)
* Currently pregnant or nursing
* Does not have a mobile phone that can send and receive text messages or unwilling to receive study texts
* Uncontrolled serious mental illness or substance abuse or inpatient treatment for these in the past 6 months
* Uses non-cigarette tobacco products and does not plan to quit all tobacco.
* Has a history of kidney problems or receives dialysis
* Had any thoughts that they would be better off dead or of deliberate self-harm in the prior 4 weeks
* Had a heart attack in the past 4 weeks
* Mental conditions that would prohibit the participant from completing the protocol
B: Inclusion Criteria:

* Subjects must have smoked an average of at least 10 cigarettes per day during the past year and over the month prior to the screening visit, with no period of abstinence greater than 3 months in the past year.

Exclusion Criteria:

* Subjects who have used bupropion (Zyban or Wellbutrin) previously.
C: Inclusion Criteria:

* Subjects must have smoked an average of at least 10 cigarettes per day during the past year and over the month prior to the screening visit, with no period of abstinence greater than 3 months in the past year.

Exclusion Criteria:

* Subjects who have used bupropion, Zyban, or Wellbutrin previously.
D: Inclusion Criteria:

* Male or female daily smokeless tobacco users aged 18 years and older, who are motivated to stop use of all tobacco products.
* Subjects must be daily users of nicotine containing smokeless tobacco and using smokeless tobacco on at least 8 occasions per day averaged over a week.
* Have used smokeless tobacco for at least 1 year prior to screening with no period of abstinence \>3 months in the past year.

Exclusion Criteria:

* Subjects using nicotine containing products (including smoking tobacco) other than smokeless tobacco for 3 months prior to screening.
* Subjects with exhaled Carbon Monoxide (CO) \>10 ppm at baseline.
* Subjects who have used varenicline, bupropion, or NRT within 3 months of screening.
* Subjects currently or within the past 12 months requiring treatment for depression or have a current or prior history of panic disorder, psychosis, bipolar disorder or any other serious mental illness.

Answer: C