Stimulants: Amphetamines , Cocaine , Pseudoephidrine, Nicotine , Caffeine
Depressant: Alcohol , Major tranquilizers , Benzodiazepines (e.g. Valium, Temazepam), Opioids (heroin, morphine) , Volatile substances (can also be classified as 'other' (glue, petrol, and paint).
Psychoactive: LSD , Psilocybin (magic mushrooms) , Mescaline (peyote cactus)