| Summary: | A detailed investigation of pipe smoking was undertaken to elucidate why this mode of smoking produced condensates of low dichlorophenolindophenol (DCIP)-reducing activity. Pipe tobaccos, smoked in cigarette tubes, gave reducing activities distinctly lower than those obtained for flue-cured tobacco, but the values were still higher than those obtained in pipe smoking. In pipe smoking, using both flue- and air-cured tobaccos, the initial high specific reducing activities (during 5-10 minutes of smoking) dropped to very Iow values towards the end of smoking. The decreasing specific activities paralleled the formation of water. No reducing activity was trapped by the water accumulating in the pipe, but a considerable amount of activity was trapped by the unsmoked tobacco. Unlike cigarette and cigarillo smoking, the trapped activity in cigar and pipe smoking was sufficient to significantly alter specific activity, but stilI much too Iow to obtain, in cigar and pipe smoking, the large totaI activities obtained in cigarette and cigarillo smoking. In the other three modes of smoking, viz cigarette, cigarillo and cigar, there was no change in specific activity with increase in duration of smoking (or change in butt length).
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