Please assess the completion status of the following clinical trial:

Trial Title: E-Cigarette Effects on Markers of Cardiovascular and Pulmonary Disease

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: CASE_CONTROL
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* able to read and write English~* no plans to quit smoking and/or e-cig use in the next month~* not using cigars/smokeless/snus tobacco \>/= 1 time per week~* having a stable pattern of current product use~* able to walk at least 2 blocks without assistance or stopping~* Specific to Exclusive Smokers:~  * smokes daily~ * \>/= 5 cigs/day for last 6 months~ * \< 3 uses E-cigs in lifetime~ * \>/= 5 ppm carbon monoxide (CO)~ * Cotinine \> 100 ng/ml~* Specific to Exclusive E-cig users:~  * \</= 2 days per month cigarette use for last 6 months~ * \>/= 5 days per week E-cig use for last 3 months~ * \</= 4 ppm CO~ * Cotinine \> 100 ng/ml~* Specific to Never-users~  * \< 100 cigarettes in a lifetime, none for \> 5 years~ * \< 3 E-cig uses in a lifetime~ * \</= 4 ppm CO~ * Cotinine \< 100 ng/ml~Exclusion Criteria:~* current use of a smoking cessation medication~* women who are pregnant or plan to get pregnant in the coming month~* women who might be pregnant~* incarcerated individuals~* history of sarcoidosis in past 5 years, or active interstitial lung/pulmonary fibrosis~* history of positive Coronavirus-19 test

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

Study Arms:
- Exclusive Smokers (Type: None): Smokes Daily; \>/= 5 cigarettes/day for last 6 months
- Exclusive E-Cig users (Type: None): E-cig usage \>/= 5 days/week for last 3 months
- Never users (Type: None): \< 100 cigarettes in lifetime, none for \> 5 years; \< 3 E-cig usage in lifetime

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