>I wonder how they define "risk to society." In particular I wonder why tobacco is ranked so high on the list. It represents a cost to society, no question, but a cost is not the same thing as a risk.

Maybe they just mean the health risks related to passive smoking? Certainly nowhere near the scale of risk to society brought on by users of crack cocaine or heroin; but worth raising none-the-less.

>As far as the drug dealers, don't they mostly kill each other?

Some drug dealers may be wrapped up in "Gang" culture killings but what worries me more than the dealers fighting amongst each other are the users killing people for money to feed heir habit. I've read a number of stories in our local paper regarding elderly people dying after being mugged for the equivalent of a handful of cents! A local boy was stabbed once for 50 pence - 50 pence won't even get you a cup of coffee from a vending machine let alone a pipe of Crack... how many people did that one user have to assault to get enough for his next fix?