Inclusion/Exclusion criteria for the three arms, with exceptions noted below:

Inclusion Criteria:

   - 18 years or older

   - Able to read and understand English

   - For the smokers, desire to quit smoking (specifically, report a motivation of ≥ 5 out
   of 10 to quit smoking on a 10-point Likert-type scale), and report being a daily
   smoker for at least one year, smoking an average ≥ 5 cigarettes per day

   - For the pain group, report suffering from chronic pain syndromes, such as fibromyalgia
   or chronic low back pain

   - For the stress group, report experiencing moderate to extreme stress or anxiety in the
   past month

   - Having access to wireless internet connection or mobile data

Exclusion Criteria:

   - Meeting criteria for drug abuse, including use of dissociative anesthetics,
   hallucinogens, opioids, cocaine, or amphetamine within the last 3 months

   - Severe psychiatric or structural brain disease (i.e. psychosis, stroke with functional
   impairment, dementia) or current/recent risk to self

   - Hearing impairment that would impede ability to listen the auditory intervention

   - Major illnesses impacting the study results

   - For smokers, currently taking Wellbutrin, Chantix, or other pharmacological smoking
   cessation aids that could confound results of the study