0.5 1.0 1.5 2.0 2.5 3.0 Social Harm (mean) Dependence (mean) Physical Harm (mean) Alcohol Street Methadone Barbiturates Cocaine Heroin Khat Alkyl Nitrites Ecstasy GHB Benzodiazepines Amphetamine Tobacco Buprenorphine Cannabis Solvents 4-MTA LSD Methylphenidate Ketamine Anabolic Steroids