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excerpt:
"They asked a group of 29 consultant psychiatrists who specialise in addiction to rate the drugs in nine categories. Three of these related to physical harm, three to the likelihood of addiction and three to social harms such as healthcare costs. The team also extended the analysis to another group of 16 experts spanning several fields including chemistry, pharmacology, psychiatry, forensics, police and legal services.
The final rankings placed heroin and cocaine as the most dangerous of the 20 drugs. Alcohol was fifth, the class C drug ketamine sixth and tobacco was in ninth place, just behind amphetamine or "speed".
Cannabis was 11th, while LSD and ecstasy were 14th and 18th respectively. The rankings do take into account new evidence that specially cultivated "skunk" varieties of cannabis available now are two to three times stronger than traditional cannabis resin."