Adolescent substance use continues to be a prevalent concern, stimulating widespread initiatives aimed at better understanding the developmental consequences of early and chronic exposure. Marijuana and alcohol are often used in tandem, and are consistently the most frequently used substances among teens (Schweinsburg, Brown, & Tapert, 2008) (SAMSHA, 2007). Harmful effects of marijuana and alcohol span physiological, social, and psychological functioning (Macleod et al., 2004; Tucker, Ellickson, Collins, & Klein, 2006a, 2006b). Given the extent of neuromaturation occurring during this time, the neurobiological and neurocognitive vulnerabilities associated with combined marijuana and alcohol use are of great interest.
