Tar (tobacco residue)
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Tar is the common name for the resinous, partially combusted particulate matter produced by the burning of tobacco and other plant material in the act of smoking. Tar is toxic and damages the smoker's lungs over time through various biochemical and mechanical processes. Tar also damages the mouth by rotting and blackening teeth, damaging gums, and desensitizing taste buds. Tar includes the majority of mutagenic and carcinogenic agents in tobacco smoke (IARC, 1986). Polycyclic aromatic hydrocarbons (PAH), for example, are genotoxic via epoxidation.
There is a common misconception that the tar in cigarettes is equivalent to the tar used on roads. As a result of this, cigarette companies in the United States, when prompted to give tar/nicotine ratings for cigarettes, usually use "tar", in quotation marks, to indicate that it is not the road surface component. Tar is occasionally referred to as an acronym for total aerosol residue, a backronym coined in the mid-1960s.
Tar, when in the lungs, coats the cilia causing them to stop working and eventually die, causing such conditions as lung cancer as the toxic particles in tobacco smoke are no longer trapped by the cilia but enter the alveoli directly. Thus, the alveoli cannot come through with the process that is called ‘gas exchange’ which is the cause of rough breathing.
The tar from cigarette smoke is similar to that of marijuana smoke.
 One of the best known diseases caused by smoking is Lung Cancer. A few carcinogens (any substance that has an involvement in the making of cancer cells) that are commonly found in tar include benzene, acrylamide and acrylonitrile. Smoking exposes those delicate cells inside the lungs directly to these compounds. This causes mutations in the DNA of the cells and then this therefore leads to cancer. According to the World Health Organization's report on "Tobacco Smoke and Involuntary Smoking," 90 percent of all cases of lung cancer are attributable to smoking.
Third-hand smoking and its effects
Third-hand smoke 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 is posing a potential health hazard to nonsmokers who are exposed to it, especially children.
As studies have shown 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.
Dangers of third-hand smoking
For other people, tobacco smoking smoking (also known as "third-hand smoking") is a serious concern, especially as it effects other people's health. In a house, the tobacco residue of the smoke can build up on surfaces over time. Unfortunately, the excess smoke can not be removed just be airing out rooms and opening windows. Scientists reported that Third-hand smoke, may cause up to 60 percent of the harm caused by regular exposure to the smoke.
The only solution in protecting surrounding people, especially the young children is for the person to either quit smoking or institute a smoke-free area elsewhere.
Second hand smoking vs third-hand smoking
Second hand smoking (SHS) is a combination of the side stream smoke (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 contribute to health effects. Many include chemicals such as ammonia, acrolein, carbon monoxide, hydrogen cyanide, nicotine, nitrogen oxides, and sulfur dioxide etc., many of these chemical are concerning 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).
- Nicole Wolverton (Sep 2, 2010), Effects of Tar in Cigarette Smoke, Livestrong, retrieved Jan 16, 2013
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