why do they put tar in cigarettes

One of the most known diseases caused by smoking is lung cancer. A few
commonly found in tar include, and. Smoking exposes delicate cells inside the lungs directly to these compounds. This causes mutations in the DNA of the cells, which leads to cancer. According to the World Health Organization's report, "Tobacco Smoke and Involuntary Smoking," 90 percent of all cases of lung cancer are attributable to smoking. is residual nicotine and other chemicals left on a variety of indoor surfaces by tobacco smoke. This residue reacts with indoor pollutants to create a toxic mix. Containing cancer-causing substances, this third-hand smoke poses a potential health hazard to nonsmokers who are exposed to it, especially children. Studies have shown that third-hand smoke clings to many things such as hair, skin, clothes, furniture, drapes, walls, bedding, carpets, dust, vehicles and other surfaces, even long after smoking has stopped.

Individuals at risk such as infants, children and nonsmoking adults may suffer tobacco-related health problems when they inhale, ingest or touch substances containing third-hand smoke. Third-hand smoke is a relatively new concept, and researchers are still studying its possible dangers. Third-hand smoking can be a serious concern, as it affects other people's health. In a house, the tobacco residue of the smoke can build up on surfaces over time. Unfortunately, excess smoke can not be removed just by airing out rooms and opening windows.

Scientists have reported that third-hand smoke may cause up to 60 percent of the harm caused by regular exposure to smoke. (SHS) is a combination of (i. e. , smoke emitted from the burning cigarette, pipe, or cigar) and the mainstream smoke exhaled from the lungs of smokers. It contains more than 4,000 chemicals, many of which are known to affect health. These may include ammonia, acrolein, carbon monoxide, hydrogen cyanide, nicotine, nitrogen oxides, and sulfur dioxide, many of which contain irritants and toxicants to the eye and respiratory tract. Third-hand smoking (THS) consists of residual tobacco smoke pollutants that remain on surfaces and in dust after tobacco has been smoked, are re-emitted into the gas phase, or react with oxidants and other compounds in the environment to yield secondary pollutants.

Chemicals of tobacco smoking include nicotine, 3-ethenylpyridine (3-EP), phenol, cresols, naphthalene, formaldehyde, and tobacco-specific nitrosamines (including some not found in freshly-emitted tobacco smoke). is one of many chemicals found in cigarettes. is a viscous (thick) black liquid. Most tar is produced from coal as a byproduct of coke production, but it can also be produced from petroleum, peat or wood. As a cigarette is smoked, the amount of in cigarettes inhaled into the lungs tends to increase, so for example, the last puff can contain more than twice as much as the first puff. When cigarette smoke is inhaled it condenses and deposits cigarette tar in the lungs.

This tar then transports many of the dangerous chemicals in cigarettes smoke directly into the body. Tar was an essential component of the first sealed, or tarmac, roads and is still used as a solid on road surfaces today. Historically, it was also used as seal for roofing shingles and to seal the hulls of ships and boats. that the list of chemicals included in this section (see the list on the left) is not a complete list of all the substances found in cigarettes, cigars, and other tobacco products. that the list of chemicals included in this section is not a complete list of all the substances found in cigarettes, cigars, and other tobacco products.

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