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Old 06-24-2015, 07:57 PM
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Secondhand Smoke

Quoted from above link:
What about lingering smoking odors?
Thereís no research in the medical literature as of yet showing that lingering cigarette odors cause cancer in people. Research does show that particles from secondhand tobacco smoke can settle into dust and onto surfaces and remain there long after the smoke is gone. Some studies suggest the particles can last for months. Even though itís no longer in the form of smoke, some researchers call this thirdhand smoke or residual tobacco smoke.

Tobacco smoke residue is still being studied. Particles that settle out from tobacco smoke can combine with gases in the air to form cancer-causing compounds that arenít found in the fresh smoke. NNK and PAHs (polycyclic aromatic hydrocarbons), carcinogens that are known to cause lung cancer, have been found in dust samples taken from the homes of smokers. Research has also shown that thirdhand smoke can damage the DNA of human cells in cell cultures.

Though yet unknown, the cancer-causing effects of smoke residue would likely be small compared with direct exposure to SHS. Still, the compounds may be stirred up and inhaled with other house dust, and may also be absorbed through the skin or accidentally taken in through the mouth. This is why any risk the compounds pose may be larger for babies and children who play on the floor and often put things in their mouths.

More recent research has shown that these compounds that settle into fabrics can be removed by normal washing.

No actual cancer risk has been measured at this time, but the health risks of smoke residue are an active area of research.
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