I think, as with legal drugs, it's down to personal preference whether you use it. As with legal drugs it's probably not much of an issue if used occasionally in moderation and a real danger if abused. It also probably depends on the person, just as drinking alcohol. I have friends who become total @rseh0les after a few drinks and friends who are happy drunks.
What the government needs to focus on is not the nannying aspects of controlling what people can choose to spend their life doing, but the effect it has on society. No one can argue that the trade in illegal drugs is harming society, probably more than the effects to individual users. Drug use, due mainly to its' legal status, carries with it a wave of crime and exploitation which affects everyone, not just the few who choose to indulge, and that's what the government and Police need to focus on destroying.
To a certain extent the Dutch approach of legalising, within limits, less harmful drugs so it blows the whole black market open and allows them to deal with the elephant in the room, and also control quality, has some merit. Not a very "British" way of doing things though.
I know that whilst I don't have a strong opinion on it at the moment, it would be a different story if some junkie broke into my car to finance their next fix.
I believe the Police have issued a statement saying it won't radically change their response to personal posession so it seems the whole exercise was just another new labour headline-grabbing bit of spin.
Kevin