Please assess the completion status of the following clinical trial:

Trial Title: Endothelial Function and Autonomic Regulation After Short-term Smoking Cessation: Varenicline Versus Placebo

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

Eligibility Criteria:
Inclusion Criteria:~* Regular smokers (currently \>10 cigarettes/day; \>5 pack years)~* Willing to quit smoking for at least the duration of the study~* Able and willing to give written informed consent~Exclusion Criteria:~* Known condition causing endothelial dysfunction except smoking (i.e. diabetes, hyperlipi¬demia, arterial hypertension, obesity)~* Regular drug treatment and/or sporadic consumption of drugs within the last 4 weeks (exclusion has to be decided in each individual)~* Acute or chronic illness~* Participation in clinical trial within 1 month before the study~* Excessive daily intake of alcohol (\>2 servings per day) or caffeine (\>4 servings/day)~* Drug and/or alcohol abuse.

- Gender: MALE
- Minimum Age: 18 Years
- Maximum Age: 40 Years
- Healthy Volunteers: t

Study Arms:
- Varenicline (Type: ACTIVE_COMPARATOR): Participants on this arm will receive varenicline tablets for 15 days.
- Placebo (Type: PLACEBO_COMPARATOR): Participants on this arm will receive placebo tablets for 15 days.

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