Please assess the completion status of the following clinical trial:

Trial Title: The Reinforcing Mechanisms of Smoking in Adult ADHD

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: FACTORIAL
- Observational Model: None
- Primary Purpose: BASIC_SCIENCE
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE1/PHASE2
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* An age of 18 to 45 years~* A history of ADHD~* Current diagnosis of ADHD according to clinical criteria~* Current treatment with stimulant medication~* Smoking of 10 cigarettes or more per day~Exclusion Criteria:~* Treatment for any major medical illness such as cancer, heart disease, diabetes, skin diseases, current major depressive episode, and schizophrenia even if currently controlled by medication~* Current pregnancy, as measured by a pregnancy test (Clear Blue Easy, Unipath, Bedford, UK), or planning to become pregnant within the next 6 months. These individuals will not be included because smoking may cause harm to the unborn fetus~* Nursing mothers~* Non-English speaking people, because the majority of measurements used in the study have not been validated in languages other than English

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 45 Years
- Healthy Volunteers: f

Study Arms:
- ADHD medication versus placebo (Type: EXPERIMENTAL): For the ADHD medication condition, participants received their usual dosage of their usual ADHD medication (e.g., Dextroamphetamine; Amphetamine mixed salts; Atomoxetine; O-Methylphenidate; Lisdexamfetamine). For the placebo condition, a placebo pill was administered.

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