a filter cigarette has a wrapper surrounding the filter and retaining it on the end of the tobacco rod . at least one portion of the wrapper overlying the filter and extending circumferentially at least partly around the cigarette at a distance from the mouth end is delimited by a line or lines of weakness in the wrapper and is at least partly removable to expose a portion of the surface of the filter , whereby ventilating air can pass beneath the wrapper to reach the mouth end of the cigarette .