The invention relates to a smoking article comprising a part, for example a part in a cigarette filter, which is displaceable longitudinally of the article and is connected to another part thereof by heat-shrinkable film material so arranged that shrinkage of the said material longitudinally of the article caused by heat from the approaching coal when the article is smoked will impart longitudinal displacement to the said displaceable part, for instance for effecting rupture of a capsule contain...

The invention relates to a tobacco-smoke filter comprising regions extending substantially longitudinally of the filter and separated by a diaphragm or diaphragms of vapour-porous material into at least one region providing a through path for smoke and at least one region which is filled with carbon and is closed against smoke flow through the filter. The regions may be formed by two co-axial tubes, an inner diaphragm tube of the porous material and an outer tube of substantially smoke-imperviou...

The invention is concerned with a wrapped cigarette and a method of producing the wrapper. A very highly porous wrapping paper, with an air porosity within the range from 2,450 to 20,000cm.sup.3 min.sup.-1 10cm.sup.-2 10cmWG.sup.-1 is produced by perforation from a base paper having a tensile breaking strength of not less than 85 g per mm width of paper. The means number of perforations is suitably within the range from 10 to 150 per cm.sup.2 of the paper and the mean diameter within the range f...

According to the invention, a material for the filtration of tobacco smoke by reduction of vapor-phase constituents without adverse effect on the taste of the smoke comprises carbon particles of a size substantially within the range of 300 to 1700 micron, coated over their surfaces, individually and without being bonded together, with a barrier layer which has a thickness within the range of 5 .times. 10.sup.-4 to 0.5 micron and which is discontinuous in that it has a porosity within the range o...