As there is no safe level of exposure to second-hand tobacco smoke, the only way to safeguard people's health is a total ban on smoking at work and in public places, which has the added benefit of helping tobacco users to give up their habit.
不管吸二手烟程度如何都不安全，保护人们健康的唯一办法是完全禁止在工作场所和公共场所吸烟，这有着帮助吸烟者放弃习惯的额外好处。