| A | B |
| Alcohol | A depressant-affects liver |
| Cocaine | Highly addictive-rapid tolerance |
| Barbiturates | Depressants- slows functions |
| Amphetamines | Stimulants- increases heart rate |
| Inhalants | effects are experienced rapidly due to direct passage to brain |
| Nicotine | legal but highly addictive |
| Caffeine | causes anxiety, irritibility in high doses |
| Marijuana | psychological addicition-euphoria |