Neural Mechanisms Associated With Risk of Smoking Relapse

Smoking is the greatest preventable cause of mortality and a significant economic burden. Even with the best available treatments, most smokers relapse within days or weeks after a quit attempt. Nicotine replacement therapy, the most widely used pharmacotherapy, yields end of treatment quit rates of <25% suggesting that managing nicotine withdrawal is not sufficient. To improve quit rates significantly, a more refined mechanistic understanding is needed. Neuroimaging can identify mechanisms underlying behavior change beyond self-report and behavioral measures. Functional magnetic resonance imaging (fMRI) studies show that brief (e.g., 24 hr.) abstinence from smoking produces working memory deficits associated with reduced neural activity in cognitive control circuits. This study will examine how abstinence-induced brain changes contribute to clinical outcomes in treatment-seeking smokers. Using a validated fMRI abstinence challenge paradigm, 200 treatment-seeking smokers will complete two 1-hour pre-treatment fMRI scans: after smoking satiety and after 24 hours of confirmed abstinence. Approximately 50% of participants will complete the smoking session first, followed by the absence session, and the remainder will complete the opposite order (counterbalanced). The investigators will examine brain responses during the performance of tasks probing working memory. Participants will then set a target quit date, receive smoking cessation counseling, and be monitored for 6 months to assess time to relapse using a validated smoking relapse protocol.

Inclusion criteria

Eligible participants will be:

• Treatment-seeking smokers between the ages of 18 and 65, reporting consumption of at least 5 cigarettes per day for at least the past 6 months;
• Planning to live in the area for at least the next 3 months;
• Capable of giving written informed consent, which includes compliance with the requirements and restrictions listed in the combined consent and HIPAA form;
• Able to communicate fluently in English (speaking, writing, and reading).

Exclusion criteria

Subjects who present and/or self-report with the following criteria at any point during study participation will not be eligible to participate in the study:

Smoking Behavior:

• Use of chewing tobacco or snuff or cigars;
• Current enrollment or plans to enroll in another smoking cessation program or research study in the next 3 months;
• Current or anticipated (within the next 3 months) use of smoking cessation medications or nicotine replacement therapy (NRT);
• A baseline carbon monoxide (CO) reading less than or equal to 8ppm.

Alcohol/Drugs:

• Diagnosis or treatment for alcohol or drug abuse in the past two years as reported during phone screen (e.g., alcohol, opioids, cocaine, or stimulants);
• Current alcohol consumption that exceeds 25 standard drinks/week;
• Positive breath alcohol concentration test (BrAC greater than or equal to 0.01) at intake;

a. Participants testing positive for breath alcohol with a reading equal to or greater than .08 (the legal driving limit) or who are visibly impaired will be instructed not to drive themselves home after the appointment. If a participant needs to use a phone to call for a safe ride home, an office telephone will be made available to the participant.

• A positive urine drug screen for cocaine, opiates, PCP, benzodiazepines, methadone, MDMA, amphetamine, methamphetamine, tri-cyclic antidepressants and/or barbiturates at any session;

Medication:

Current use or recent discontinuation (within the past 30 days at the time of Intake) of:

• Smoking cessation medication (e.g., Zyban, Wellbutrin, Wellbutrin SR, Chantix, NRT);
• Anti-psychotic medications;
• Anti-depressants (tricyclics, SSRI's, selective and nonselective MAOIs, Wellbutrin/Zyban);
• Anti-anxiety agents;
• Anti-panic agents;
• Prescription (e.g., Provigil, Ritalin) or over-the-counter stimulants;
• Prescription sleep aids (e.g., Ambien, Lunesta) if used more than 2x/week. If participants report use less than twice a week, they will just be asked to refrain from use during imaging portion of the study.
• Any medication that could compromise participant safety as determined by the Principal Investigator and/or Study Physician;

Daily use of:

• Opiate-containing medications for chronic pain.

Medical/Neuropsychiatric:

• Women who are pregnant, planning a pregnancy, and/or breast feeding. All female subjects of childbearing potential will undergo a urine pregnancy test at Intake and both fMRI scan visits (3 urine pregnancy tests in total).
• History of epilepsy or a seizure disorder;
• History of stroke;
• Self-reported brain or spinal tumor;
• Self-reported history or current diagnosis of psychosis, bipolar disorder, schizophrenia, current major depression (subjects with a history of major depression but in remission for past 6 months are eligible), or any Axis 1 disorder.

fMRI-Related:

• Self-reported history of head trauma;
• Self-reported brain (or CNS) or spinal tumor;
• Self-reported use of pacemakers, certain metallic implants, or presence of metal in the eye as contraindicated for fMRI;
• Self-reported history of claustrophobia;
• Being left-handed;
• Color blindness;
• Weight greater than 299lbs;
• Self-reported history of gunshot wounds;
• Any impairment preventing participants from using the response pad necessary for the cognitive testing;
• Circumstances or conditions that may interfere with magnetic resonance imaging (MRI).

General Exclusion:

• Any medical condition, illness, disorder, or concomitant medication that could compromise participant safety or treatment, as determined by the Principal Investigator;
• Low or borderline intellectual functioning - determined by a score of less than 85 on the Shipley Institute of Living Scale (SILS) (administered at Intake Visit);
• Enrollment or plans to enroll in another research study;
• Inability to provide informed consent or complete any of the study tasks as determined by the Principal Investigator.