Please assess the completion status of the following clinical trial:

Trial Title: Effects of Varenicline on Brain Activity During Nicotine Abstinence

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: TRIPLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~1. Treatment-seeking smokers between the ages of 18 and 65, that smoke at least 10 cigarettes/day for at least the past 6 months~2. Provide a baseline CO (carbon monoxide) reading of \>10ppm~3. Provide written informed consent and are fluent, English-speaking~4. Weight of equal to or less than 300 lbs~Exclusion Criteria:~Smoking Behavior~1. Use of chewing tobacco, snuff or cigars~2. Current enrollment or plans to enroll in another smoking cessation program in the next 5 months~3. Plan to use other nicotine substitutes or smoking cessation treatments in the next 5 months~4. Provide a baseline CO (carbon monoxide) reading ≤10 ppm~Alcohol/Drug Exclusion Criteria~1. History of substance abuse and/or currently receiving treatment for substance abuse~2. Current alcohol consumption that exceeds 25 standard drinks/week~3. A breath alcohol concentration reading ≥ 0.01 at the H\&P (health \& physical) screening or either of the lab sessions~Medication Exclusion Criteria~1. Prior use of Chantix~2. Current use or recent discontinuation (within last 14-days) of the following medications:~   1. Any form of smoking cessation medication~  2. Any form of anti-psychotic medications that includes:~      * antipsychotics,~     * atypical antipsychotics,~     * mood-stabilizers,~     * anti-depressants (tricyclic, SSRI, MAOI),~     * anti-panic agents,~     * anti-obsessive agents,~     * anti-anxiety agents, and~     * stimulants (e.g., Provigil, Ritalin)~     * herbal medications (St. John's Wort)~  3. Opioid medication for chronic pain~  4. Anti-coagulants~  5. Any heart medications~  6. Daily medication for asthma~Medical Exclusion Criteria~1. Women who are pregnant, planning a pregnancy, or lactating;~2. History or current diagnosis of psychosis, current major depression, bipolar disorder, ADHD, schizophrenia, or any Axis 1 disorder as identified by the MINI~3. Serious or unstable disease within the past 6 months (heart disease, HIV)~4. Diagnosis of cancer in the past 6 months or if successful treatment for cancer has not ended within the past 6 months~5. History of epilepsy or a seizure disorder~6. History or current diagnosis (last 6-months) of abnormal rhythms and/or tachycardia (\>100 beats/minute); history or current diagnosis of COPD (chronic obstructive pulmonary disease), cardiovascular disease (stroke, angina, coronary heart disease), heart attack in the last 6 months, uncontrolled hypertension (SBP\>150 or DBP\>90)~7. History of kidney and/or liver failure (including transplant)~8. History of head trauma or prior seizure; family history of a seizure disorder, brain (or central nervous system) tumor~9. Use of pacemakers, certain metallic implants, or presence of metal in the eye as contraindicated for MRI (magnetic resonance imaging);~10. Low or borderline intellectual functioning - determined by receiving a score \<80 on the Shipley verbal IQ Test~11. Non-English speaking; determined at phone screen~12. History of claustrophobia (contraindicated for MRI) or color blindness (task requires color recognition); self-report at telephone screen~13. Being left-handed~14. Any fore-limb deformity~15. Wearing cochlear implant or bi-lateral hearing aids~General Exclusion~1. Any medical condition or concomitant medication that could compromise participant safety or treatment, as determined by the Principal Investigator and/or Study Physician.~2. Inability to provide informed consent or complete any of the study tasks as determined by the Principal Investigator and/or Study Physician.~3. Any physical or visual impairment that may prevent the individual from using a computer keyboard or completing any study tasks.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: t

Study Arms:
- Placebo (Type: PLACEBO_COMPARATOR): None
- Varenicline (Type: ACTIVE_COMPARATOR): None

Based on this trial design, predict the completion outcome and termination type (if applicable).