A cigarette is a narrow cylinder containing psychoactive material, typically tobacco, that is rolled into thin paper for smoking. Most cigarettes contain a reconstituted tobacco product known as sheet, which consists of recycled [tobacco] stems, stalks, scraps, collected dust, and floor sweepings, to which are added glue, chemicals and fillers; the product is then sprayed with nicotine that was extracted from the tobacco scraps, and shaped into curls.[1] The cigarette is ignited at one end, causing it to smolder; the resulting smoke is orally inhaled via the opposite end. Most modern cigarettes are filtered, although this does not make them safer. Cigarette manufacturers have described cigarettes as a drug administration system for the delivery of nicotine in acceptable and attractive form.[2][3][4][5] Cigarettes are addictive (because of nicotine) and cause cancer, chronic obstructive pulmonary disease, heart disease, and other health problems.