Answer:
Speed is not a drug. It is a catch-all term for central nervous system stimulants like amphetamine, methamphetamine, and similar drugs such as methylphenidate, and is occasionally used to refer to cocaine.

All CNS stimulants are addictive if used to excess, and the onset of addiction is rapid.
First answer by Zenballwizard. Last edit by Zenballwizard. Contributor trust: 639 [recommend contributor recommended]. Question popularity: 2 [recommend question].