Box of 10 'Filtro Neto' cigarette filters, London, England, 1999
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A practice where a substance, most commonly tobacco is burned and the smoke inhaled. It is currently practiced by over one billion people worldwide (2008)
Glossary: cigarette filter
Inflammable blackish viscous liquid obtained by the distillation of wood or coal. As a constituent of cigarettes, tar is known to have cancer causing properties.
Any cancerous tumour. It arises from the abnormal and uncontrolled division of cells which then invade and destroy the surrounding tissues. Cancer cells spread and can form secondary tumours some distance from the original.