The scientists found alcohol was most harmful, with a score of 72, followed by heroin with 55 and crack with 54.
Among some of the other drugs assessed were crystal meth (33), cocaine (27), tobacco (26), amphetamine or speed (23), cannabis (20), benzodiazepines, such as Valium (15), ketamine (15), methadone (14), mephedrone (13), ecstasy (9), anabolic steroids (9), LSD (7) and magic mushrooms (5).
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