Please assess the completion status of the following clinical trial:

Trial Title: Efficacy and Safety of E-cigarettes for Smoking Cessation in Middle-aged Heavy Smokers

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE4
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* Aged between 25 to under 75 years~* Has smoked over 10 years on a daily basis and being a current smoker with at least 10 cig/day for at least past 5 years~* Good general health~* Intent to quit smoking~* Exhaled carbon monoxide level at least 15ppm at the baseline visit~* Strong nicotine dependence defined by Fagerström Test for Nicotine Dependence (FTND) ≥ 5 and by Heaviness of Smoking Index (HSI) ≥3~* intent to quit smoking~* prepared to follow the trial protocol and able to provide written consent.~Exclusion Criteria:~* Pregnancy or gestation or intend to get pregnant during the study follow-up~* Use of smoking cessation pharmacotherapy or ECs during the past year~* Attempt of smoking cessation by using of e-cigarettes during the past year~* Any cancer (at least five healthy follow-up years after stopping the cancer therapy)~* Instable (ischemic) vascular or heart disease~* Recent myocardial infarction in the past three months~* High blood pressure (systolic BP\> 140mmHg or diastolic 90mmHg at rest)~* History of major psychiatric depression or other psychiatric conditions and daily use of any psychiatric medicine~* Current addiction of alcohol or misuse of substance~* Inability to express himself/herself~* Known allergy to any of the study medications~* Severe allergy or poorly controlled asthma or other pulmonary disease~* Epilepsy

- Gender: ALL
- Minimum Age: 25 Years
- Maximum Age: 75 Years
- Healthy Volunteers: t

Study Arms:
- Nicotine containing e-cigarettes (Type: EXPERIMENTAL): Nicotine containing e-cigarettes + placebo-varenicline + Motivational Interview (MI)
- Nicotine-free e-cigarettes (Type: ACTIVE_COMPARATOR): Nicotine-free e-cigarettes + varenicline tartrate+ MI
- Motivational Interview (MI) (Type: PLACEBO_COMPARATOR): Placebo-varenicline + nicotine -free e-cigarettes + MI

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