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 it's a stimulant, many users report a feeling of calm if it's chewed over a few hours. Some describe it as being 'blissed out'.
Khat is not an illegal substance in the UK, but it is in many other countries.
Aka phencyclidine (more commonly known as angeldust), is a hallucinogen. It has similar effects as LSD but is a lot more dangerous. It can act as a hallucinogen, stimulant, depressant, and anesthetic all at the same time and it used as a horse tranquiliser.