[disinfo ed.'s note: although we ran a story about this report previously, we decided that Aaron's post had sufficient additional information to run it too.]
Not sure about the “harm score” reliability, but the chart is worth a gander nevertheless; the BBC reports:
Alcohol is more harmful than heroin or crack, according to a study published in medical journal the Lancet. The report is co-authored by Professor David Nutt, the former UK chief drugs adviser who was sacked by the government in October 2009. It ranks 20 drugs on 16 measures of harm to users and to wider society.