“…The original QSU and other briefer versions of the instrument have been used successfully to track craving changes in a wide variety of research manipulations, for example, smoking deprivation, alcohol consumption, nicotine replacement, and exposure to smoking-related cues (e.g., Burton & Tiffany, 1997;Cepeda-Benito & Tiffany, 1996;Conklin, Tiffany, & Vrana, 2000;Cox, Tiffany, & Christen, 2001;Drobes & Tiffany, 1997;King & Meyer, 2000;Teneggi et al, 2002). In addition, a few of the studies that have addressed the construct validity of the QSU (e.g., Willner, Hardman, & Eaton, 1995) have reported findings that support the two-dimensional structure proposed by Tiffany and Drobes (1991; for a more detailed account of the strengths and weaknesses of the QSU see Cepeda-Benito, Henry, Gleaves, & Fernandez, 2004). Cepeda-Benito et al (2004) used confirmatory factor analyses (CFA) to compare the fits of one-, two-, and four-factor models of the QSU in two separate data sets: the original data from U.S. American smokers collected by Tiffany and Drobes (1991) and a new data set obtained from a sample of Spanish smokers.…”