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Thirdhand smoke is a toxic residue that sticks to surfaces and objects. People and pets come into contact with thirdhand smoke when their skin touches a surface where thirdhand smoke has collected, when they breathe in thirdhand smoke chemicals that are in the air, and when they swallow residue that are on objects that they put in their mouths. Exposure is most dangerous for babies, children, the elderly, and individuals with pre-existing health conditions.

On this page, you will find scientific information and first-hand accounts about preventing human exposure to thirdhand smoke. We also provide communication strategies for talking with others about thirdhand smoke dangers.