"The evidence is clear, there is no safe level of exposure to
second-hand tobacco smoke. I urge all countries that have not
yet done so to take this immediate and important step to protect
the health of all by passing laws requiring all indoor
workplaces and public places to be 100% smoke-free." — Dr.
Margaret Chan, Director-General, World Health Organization No
Safe Level of Secondhand Smoke There is a fast-growing movement
around the world to adopt 100 percent smoke-free laws that ban
smoking in all work and public places. Public health authorities
worldwide have concluded that there is no safe level of
secondhand smoke exposure. Secondhand smoke causes serious
diseases and premature death. Secondhand smoke has been proven
to cause lung cancer, heart disease, sudden infant death
syndrome (SIDS), low birth weight, and serious respiratory
conditions. Scientific evidence is clear that the only effective
way to protect workers and the public from secondhand smoke is
to enact 100 percent smoke-free laws that ban