Abused substances and their various effects. Comprise the given:
a) Describe the psychology and physiology of addiction.
b) Recognize specific drug substances covering the given categories: stimulants, depressants, narcotics, hallucinogens and cannabis.
c) Describe the addiction potential of different abused substances, what effects they have, and withdrawal symptoms.
d) Describe how prescription drugs can be abused and lead to the addiction.