Most of these measured reductions occur only when the cigarette is smoked on a smoking machine when smoked by a human, the compounds are delivered into the lungs regardless of whether a filter is used. While laboratory tests show a reduction of " tar" and nicotine in cigarette smoke, filters are ineffective at removing gases of low molecular weight, such as carbon monoxide. They have been shown to reduce the risk of lung cancer. įilters are intended to reduce the harm caused by smoking by reducing harmful chemicals inhaled by smokers. The plastic cellulose acetate filter and paper modify the particulate smoke phase by particle retention ( filtration), and finely divided carbon modifies the gaseous phase ( adsorption). Macroporous phenol-formaldehyde resins and asbestos have also been used. įilters may be made from plastic cellulose acetate fiber, paper or activated charcoal (either as a cavity filter or embedded into the plastic cellulose acetate fibers). Filters were introduced in the early 1950s. A cigarette filter, also known as a filter tip, is a component of a cigarette, along with cigarette paper, capsules and adhesives.
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