First chart: http://news.bbc.co.uk/1/hi/uk_politics/5230006.stm
PDF of original study: http://www.publications.parliament.uk/pa/cm200506/cmselect/cmsctech/1031/1031.pdf
Second chart: http://www.americanscientist.org/template/AssetDetail/assetid/50773?&print=yes#50979
Unfortunately a lot of people aren't very good at moderation lol That's why there's 300 lb people eating at McDonald's every day. Or using every free moment to play MMOs. Or contantly having sex/looking at porn. People abuse a lot of things besides drugs, but none of them have as much stigma attached.
Sorry if I'm derailing the thread a bit. I'm not trying to advocate the use of drugs or anything. Just stating some facts.