1. Smoking is a serious health hazard.
    吸烟严重危及健康.

2. But it does mean that noise is less dangerous than, say, being brought up in an orphanage----which really is a mental health hazard.
    但它确实说明，噪音的危险性 -- 比如说 -- 比在孤儿院长大所受的危害要小一些，孤儿院才是真正危害精神健康的地方。

3. Certainly, they hazard their jobs by working normal hours.
    他们只在正常时间内工作就肯定是在拿自己的饭碗冒险。