Drug use
- Drug injection
- Drug policy of Portugal
- East African drug trade
- Entheogen
- Golden Triangle (Southeast Asia)
- History of United States drug prohibition
- Illegal drug trade
- Performance-enhancing drugs
- Pharmaceutical drug
- Poly drug use
- Polysubstance dependence
- Prohibition of drugs
- Recreational drug use
- Self-medication
- Substance abuse
- Substance dependence
- War on drugs