“…While the majority of motivational research has focused on alcohol use, additional studies have included cigarettes and/or illicit drugs (e.g., Butler & Gunderson, 1981; Carlson & Edwards, 1987, 1990; Comeau et al, 2001; Chabrol et al, 2005; Johnston & O’Malley, 1986; Novak at al., 2003; Parks & Kennedy, 2004; Pascale & Evans, 1993; Sheppard et al, 1985; Simons & Cary, 2000; Simons & Cary, 2003). Studies that have included multiple substances have shown that unique motivation dimensions accompany different drugs (Johnston & O’Malley, 1986; Segal, 1983; Segal et al, 1982, 1980; Simons et al, 2000), and have also supported the findings that reasons differ by level of involvement (Carlson & Edwards, 1990; Johnston & O’Malley, 1986; Segal, 1983; Segal et al, 1982, 1980; Shearn & Fitzgibbons, 1973; Simons & Cary, 2000, 2003).…”