Filter tips have reduced the incidence of disease.
Thus, any statement on the efficiency of a filter tip would be both meaningless and misleading.
Protruding from her mouth was a long cigarette, with a filter tip, of course, because that is deliberately designed to give the reader confidence.
Cigarette smoke consists of a cloud of fine droplets suspended in gas, and the only practical effect of a filter tip is to retain a proportion of the droplets.
As regards filter tip cigarettes, it is too early to assess whether the increase in their production has had any effect on the incidence of lung cancer.
As regards filter tips, which were almost negligible in 1950, now 95·7 per cent, of cigarettes are filter tips.
We can argue about the significance of filter tips and so on.
