Please assess the completion status of the following clinical trial:

Trial Title: Smoking Cessation Treatment for Methadone Maintenance Patients

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Age 18 or older~* English speaking~* Smoked at least 100 cigarettes/lifetime~* Smokes 5 or more cigarettes per day~* Interested in quitting smoking (preparation or contemplation state of change)~* Enrolled in Einstein/Montefiore methadone program for 3 or more months~* Stable methadone dose for 2 weeks~* Agree to use contraception throughout the trial (among women with reproductive potential)~* Willing to participate in all study components~* Able to provide informed consent~Exclusion Criteria:~* Serious or unstable HIV/AIDS, liver, cardiovascular, or pulmonary disease~* Psychiatric instability~* Women who are pregnant, breastfeeding, or contemplating pregnancy~* Creatinine clearance less than 30 mL/min

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Varenicline (Type: EXPERIMENTAL): Drug treatment in combination with telephone quitline referral and brief individual counseling based on PHS guidelines at weeks 2, 4, 8, and 12
- Placebo (Type: PLACEBO_COMPARATOR): Matched placebo capsules in combination with telephone quitline referral and brief individual counseling based on PHS guidelines at weeks 2, 4, 8, and 12

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