Smoking a cigarette has no effect on visual temporal order discrimination in regular smokers.

A temporal order discrimination task was performed by 20 regular smokers who were tested with and without a pre-test cigarette in a repeated measures design following overnight abstinence. Subjects were asked to discriminate the temporal order of the rapid sequential illumination of two lights positioned equidistant from a central fixation point. None of the measures of performance in this task were significantly affected by smoking.