The relationship between extraversion/sociability and problematic alcohol involvement remains unclear. Though some studies have indicated a positive relation between extraversion/sociability and drinking onset (Hill, Shen, Lowers, & Locke, 2000; Hill & Yuan, 1999), alcohol consumption among nonalcoholics (Cook, Young, Taylor, & Bedford, 1998; Flory, Lynam, Milich, Leukefeld, & Clayton, 2002; Grau & Ortet, 1999; Martsh & Miller, 1997), and the later development of alcohol problems (Kilbey, Downey, & Breslau, 1998; Wennberg, 2002), many studies of extraversion and alcohol problems/consumption have yielded negative findings (e.g., LoCastro, Spiro, Monnelly, & Ciraulo, 2000; Stacy & Newcomb, 1998; see Sher et al., 2005, for a discussion).
