Walking around saying that weed does not have any negative effects is not going to help the cause for legalisation one bit. Skunk is clearly a pretty strong drug that is best kept away from young, developing minds. This is the entire reason why I think it has not been decriminalised in much of Europe. It's pretty much accepted over here, that it is widespread amongst a wide range of people and does not do a lot of harm. Everyone knows that alcohol does much more harm to society at large than smoking fags or weed. And most people accept that the 'gateway' argument would pretty much disappear if it was legalised.
I think that if people could guarantee that only over 18's or 21's could get a hold of it, then many if not all objections to the decriminalisation would be dropped. But of course the majority of the media in England is not remotely rational when it comes to talking about illegal drugs. Take the case of Methadrone or meow meow. It's a relatively harmless alternative to Coke or E. But the media got a hold of it, put a huge amount of negative spin on some stories, and forced the government to swiftly ban the substance. Since it has been banned, people have been forced back to cocaine, which really does do a lot of harm to individuals, society and the planet as a whole.