Researchers note an association between early drinking and adolescents’ use of other illicit drugs including cigarette smoking (Agrawal et al., 2006; Callas, Flynn, & Worden, 2004; Ellickson et al., 2003; Sartor et al., 2009), marijuana use (Callas et al., 2004; Ellickson et al., 2003; Sartor et al., 2009), and the use of harder drugs (Ellickson e al., 2003).
