As you are breathing in these aromas, your lungs are being filled chemicals such as: acetone, trichlorofluoromethane, carbon disulfide, 2-butanone, trichloroethane, trichloroethene, carbon tetrachloride, tetrachloroethene, chlorobenzene, ethylbenzene, styrene, xylene, phenol, cresol and cyclopentene. It's no surprise that they are a huge contributor to indoor air pollution & are known carcinogens! (meaning they contain cancer causing agents)