“…Similarly, number of puffs per cigarette averaged 11 puffs but ranged from eight to 16 puffs. Time to smoke ranged from 232 to 414 s with an average of 351 s. In addition, large individual variability in smoking topography has been reported (Gust, Pickens, & Pechacek, 1983;Guyatt, Kirkham, Baldry, Dixon, & Cumming, 1989). Furthermore, smoking topography has been shown to differ as a function of gender (Bä ttig, Buzzi, & Mil, 1982;Eissenberg, Adams, Riggins, & Likness, 1999), personality, stress level (Lombardo & Carreno, 1987), and nicotine yield of the cigarette (Bridges et al, 1990;Djordjevic, Hoffmann, & Hoffmann, 1997).…”