E cigarettes pose threat to users' and bystanders' health Novant Health Healthy Headlines 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 First, Second and Thirdhand Smoke: The Differences and Dangers Tobacco Stops With Me Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice