Khat

[Dianne]

[Khat] is a [stimulant] with similar effects to amphetamine. It is a leaf which is chewed over a number of hours.
[Chewing it] can make people feel more alert and talkative.
It can also suppress the appetite.
Although its a stimulant, many users report a feeling of calm if its chewed over a few hours. Some describe it as being blissed out.

[Cami]

The leaves of an Arabian shrub, which are chewed (or drunk as an infusion) as a stimulant.