Please assess the completion status of the following clinical trial:

Trial Title: Association Between Smoking, Brain Activity, Genes, and ADHD

Study Design Characteristics:
- Allocation: N/A
- Intervention Model: N/A
- Observational Model: N/A
- Primary Purpose: N/A
- Time Perspective: N/A
- Masking: N/A
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~1. Smokers with ADHD~   * Cigarette smoking for the last year~  * ADHD diagnosis~2. Nonsmokers with ADHD~   * No history of regularly smoking cigarettes~  * ADHD diagnosis~3. Normative control smokers~   * Cigarette smoking for the last year~  * No history and diagnosis of ADHD~4. Normative control nonsmokers~   * No history of regularly smoking cigarettes~  * No history and diagnosis of ADHD~Exclusion Criteria:~* Children under the age of 18~* Adults above the age of 45~* Pregnancy or planning to become pregnant~* Any major medical illness~* Any mental disorders that require medication (except stimulant medication)~* Any contraindications to fMRI scanning~* Not speaking English

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

Study Arms:
- Smokers with ADHD (Type: None): Smokers with ADHD participated in one overnight abstinence condition (withdrawal) and one smoking condition (smoking the first cigarette of the morning).
- Nonsmokers with ADHD (Type: None): Nonsmokers with ADHD participated in one condition.
- Control smokers (Type: None): Control smokers participated in one overnight abstinence condition (withdrawal) and one smoking condition (smoking the first cigarette of the morning).
- Control nonsmokers (Type: None): Control nonsmokers participated in one condition.

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