Brain Mechanisms of Reducing Polysubstance Use

Inclusion Criteria:

* At least 18 years old
* Free of any psychiatric diagnoses or medication (besides a substance use disorder (SUD) to alcohol, tobacco, or cannabis)
* In the past month, at least 4 episodes of heavy episodic drinking; at least 3 occasions of cannabis use; and daily cigarette use for at least the past month
* Normal or corrected-to-normal vision
* Written informed consent
* No previous meditation or NF experiences

Exclusion Criteria:

* Any psychiatric diagnoses other than an SUD
* Medical disorder(s) that may affect the central nervous system; medications that affect the central and autonomic nervous system; or a positive pregnancy test result (females)
* Excluding cannabis, evidence of recent (past month) illicit drug use