1. stimulants - such examples would be cocaine, caffeine and methamphetamine
2. depressants - such examples would be alcohol and marijuana
3. analgesics - such examples would be opiates, aspirin, ibuprofen, paracetamol
4. antibiotics - such examples would be amoxicillin, erythromycin
5. tranquilizers - also known as barbiturates, such examples would be valium, xanax
6. hallucinogens - such examples would be LSD, psilocybin mushrooms
C. can take the place of long-term goals
Hope this helps, mate!