Secondhand smoke is a known cause of death and disease. There is no safe level of secondhand smoke exposure. You are equally at risk of lung cancer, heart disease by inhaling secondhand smoke.
Worldwide, an estimated 33% nonsmoking males and 35% of nonsmoking females are regularly exposed to secondhand smoke. Among children, 40% are exposed to secondhand smoke in public places.
Every year, exposure to secondhand smoke causes over 600,000 premature deaths; 47% of which occur among nonsmoking women and 28% among nonsmoking children.
Nonsmokers who are exposed to secondhand smoke at home or at work increase their risk of developing lung cancer by 20-30%, coronary heart disease by 25-30% and acute coronary heart disease by 25-35%.