Mainstream Smoke:, Exhaled by a smoker, Sidestream Smoke:, Comes from the lighted end of a cigarette, Has higher concentrations of carcinogens, Has smaller particles that enter cells more easily, Thirdhand Smoke (THS):, Settles in dust and on surfaces, Remains for months after smoking stops, Can combine with gases in air to form cancer-causing compounds, Found in dust samples from smokers' homes, Known to damage human DNA in cell cultures.

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