For many smokers, the act of smoking cigarettes comes with a nagging sense of guilt, especially around non-smokers, children, or in shared rooms. The well-documented hazards of secondhand smoke are undeniable, linked to respiratory infections, asthma, and much more serious long-term health problems in people who inhale it. https://pagh-ulrich-2.federatedjournals.com/clearing-the-air-can-personal-air-filters-protect-others-from-secondhand-smoke