“…Past research has used pneumotachographs (e.g., Zacny et al, 1987), pressure transducers (e.g., Ossip-Klein et al, 1983), portable recorders (e.g., Hatsukami, Morgan, Pickens, & Champagne, 1990), flow meters (e.g., Ahijevych, Gillespie, Demirci, & Jagadeesh, 1996), and puff analysers (e.g., Sutton, Russell, Iyer, Feyerabend, & Saloojee, 1982). Recent technological advances have resulted in the development of sophisticated and portable devices (e.g.…”