After a recent visit to the UK, I think they should be focusing more on casual cocaine use.
At a local country pub on a Sunday evening, there were about 5 guys in their early 20's going to the toilet every 10 minutes and coming back sniffing, wiping their nose etc. It was so obvious I asked my niece what was going on and she confirmed they were taking cocaine in the toilets and that it's very common now and pretty much socially acceptable in many groups.
As for weed, pretty much harmless in my experience, unless you consider laziness, tie dye t-shirts and white guys with dreadlocks a danger to society.