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Harmful substances found in e-cigarettes include: 3 Nicotine Cancer-causing chemicals (carcinogens) Very fine particles that can be breathed into the lungs Volatile organic compounds (gases released into the air from products) Chemical flavoring that is linked to serious lung disease Heavy metals, such as nickel, tin, and lead It is hard to know exactly what is in e-cigarettes

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Bai FL, Yamano M, Shiotani Y, Emson PC, Smith AD, Powell JF et al (1985)

Areas with high humidity, such as bathrooms and kitchens, may retain smoke odors more stubbornly due to the moisture in the air