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 Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Is Vaping Making People Sick? Officials Warn of New Risks UPMC Signs Your Child is Vaping, Smoking or Chewing Tobacco SD DOH Vaping MouthHealthy Oral Health Information from the ADA