Cannabis (Marijuana) is the most widely used illicit substance in the United States ( Substance Abuse & Mental Health Services Administration, 2003 ). Its use is increasing among college students, in most student subgroups, and across students enrolled in all types of colleges ( Gledhill-Hoyt, Lee, Strote, & Wechsler, 2000 ). This escalation in use appears to be related to a heightened use of cannabis among younger adolescents as well as increased experimentation and movement toward regular use of the drug after age 18 ( Gledhill-Hoyt et al. 2000 ). More than 50% of adolescents residing in the United States experiment with cannabis and, of those who try the drug more than once, a third eventually escalate to regular use ( Gruber & Pope, 2002 ). For heavier users, symptoms of withdrawal can develop, making it increasingly difficult to quit ( Budney, Novy, & Hughes, 1999 ;  Budney, Moore, Vandrey, & Hughes, 2003 ). Moreover, cannabis use is associated with a number of social, emotional, health, and legal consequences ( Degenhardt & Hall, 2006 ;  Dennis et al., 2002 ;  Gruber & Pope, 2002 ;  Hubbard, Franco, & Onaivi, 1999 ;  Khalsa, Genser, Francis, & Martin, 2002 ;  McArdle, 2006 ;  Office of National Drug Control Policy, 2004 ) and may even serve as a “gateway” to using and abusing other illicit drugs ( Fergusson & Horwood, 2000 ;  Fergusson, Horwood, & Swain-Campbell, 2002 ;  Kandel, 2003 ;  Lynskey, Heath, Bucholz, Slutske, Madden, Nelson, Statham, & Martin, 2003 ).