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Exposure to low-level thirdhand smoke residue can increase risk for blood clotting and heart disease. In the left column, an image depicts a drawing of a mouse next to clean bedding with an arrow pointing to a clear blood vessel with the caption "normal blood clotting". In the right column, a drawing shows a mouse next to bedding contaminated with thirdhand smoke depicted as a brown residue, with an arrow pointing to a clogged blood vessel with the caption "abnormal blood clotting".

Low-Level Thirdhand Smoke Residue Can Increase Risk for Blood Clotting and Heart Disease

April 21, 2026

Thirdhand Smoke Resource Center

Part of the California Thirdhand Smoke Research Consortium and funded by the California Tobacco Related Disease Research Program, TRDRP Grant # 28PT-0078H and TRDRP Grant # T32PT6244, the Thirdhand Smoke Resource Center shares information and resources to protect Californians from exposure to persistent and toxic residue left behind by tobacco, electronic cigarette, and marijuana use.

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