Secondhand smoke and secondhand aerosol 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 Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America