Which of the following characteristics describes stimulants as a controlled substance?
A . Younger individuals who use stimulants for a euphoric effect often go on to experiment with other drugs of abuse.
B . Users tend to rely on stimulants to feel stronger, more decisive and self-possessed.
C . Stimulants are usually administered by injection or taken orally.
D . Heavy use could result in psychological dependence.
E . Tolerance develops from heavy use.
F . All of the above.
Answer: F