1.   Adult males also chew khat, a stimulant that doctors say can lead to unpredictable behavior and cause diseases and psychological disorders in the long run.

2.   But now some people in Yemen are worried that too many government workers were wasting away their afternoons -- and their income -- chewing khat.

3.   Last month, Saleh said he was reducing his daily habit of chewing khat to only the weekend.

4.   The majority of Yemenis chew khat, which doctors say can lead to unpredictable behavior and cause diseases and psychological disorders in the long run.