what is 3rd hand smoke

Third-hand smoke is a term used to describe the residual contamination from tobacco smoke that lingers following the extinguishing of a cigarette, cigar, or other combustible tobacco product. It is made up of the pollutants that settle indoors when tobacco is smoked, and the chemicals in third-hand smoke include nicotine and other carcinogens. Third-hand smoke can cling to walls, ceilings, carpets, rugs, clothes, bedsheets, car dashboards, and even toys. Children have increased exposure to third-hand smoke due to their tendency to mouth objects and touch affected surfaces, and pets can also be exposed to third-hand smoke. The health effects of third-hand smoke are still being studied, but it is increasingly recognized as a potential danger, especially to children.