WHO EMRO Second hand smoke impacts health Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Millions of people are exposed to secondhand smoke every day. People living in multi unit housing are some of the most exposed. The only way to fully protect people from secondhand smoke at FACT: Most e cigarette users also smoke cigarettes, a pattern known as dual use. This means the tobacco industry isn't helping people quit; it's sustaining addiction through another product. While the industry claims