Less is known about the dangers of thirdhand smoke, with fewer studies conducted in the area. Secondhand smoking, when exhaled fumes or the smoke from the end of a cigarette is breathed in by someone else, is thought to increase the risk of lung cancer in non-smokers by 20% to 30%. In another study, researchers at the Berkeley Lab in California exposed the same carcinogens to human lung tissue and showed they can cause DNA damage - one of the triggers of cancer. Thirdhand smoke forms when particles from a cigarette seep into materials like hair, clothes and furniture and carpets.Īnd Mail Online reports that in one study non-smokers had up to 86 times higher levels of toxic compounds known as NNK and NNN in their urine after wearing the clothes of a heavy cigarette user for three hours. The dangers of smoking and secondhand smoking are well known - but now the dangers of thirdhand smoking have been revealed.
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