(....)
alcohol scored 72 – against 55 for heroin and 54 for crack
(....)
For overall harm, the other drugs examined ranked as follows: crystal meth (33), cocaine (27), tobacco (26), amphetamine/speed (23), cannabis (20), GHB (18), benzodiazepines (15), ketamine (15), methadone (13), butane (10), qat (9), ecstasy (9),
anabolic steroids (9), LSD (7), buprenorphine (6) and magic mushrooms (5).
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http://www.guardian.co.uk/society/2010/nov/01/alcohol-more-harmful-than-heroin-crack