I'm no expert by any means but I'm always sceptical about the way information like this is presented.
Concerning the wider social costs, it would seem logical that alchohol would top the charts due to it's wider and prolonged use.
Drugs like heroin may certainly be a problem but it's still contained within a small percentage of society.
If the public as a whole were shooting up on crack-cocaine 2 or 3 times, 2 or 3 times a week (typical drinking patterns), I should think alchohol wouldn't seem like such a terrible thing.
I seriously doubt we needed to spend money on this "research" in the first place.
Do we really need someone to tell us that using alchohol can be bad for us, and that drinking heavily can be worse than taking other types of drugs?