Al:
IMO It's a political issue - not a moral issue. No politician wants to be seen to be approving of any drugs in any situation. The government could never ever get away with legalising something just for the tax benefit either (though they obviously would never say so even if that was a major motivation). It just happens to be a side benefit of legalisation. I truly believe that decriminalisation is on it's way - one day! I believe that we're better off with it out in the open and controlled.
IIRC it's local laws that make it illegal to drink in certain places (as opposed to selling or making alcohol which is obviously strictly licensed). Also (again IIRC) it's not illegal to be drunk - just illegal to sell someone a drink when they're already drunk... And no-one's suggesting that it should be legal to take drugs and drive are they? Or anything else where there are already sensible laws in place for alcohol such as selling drugs to someone underage?
And I don't believe that alcohol and cigs are only legal for tax reasons - though that would certainly be an incentive (and the financial picture isn't that simple either - what about the trade - peoples jobs - and exports - such as whiskey?). It's an accepted social norm - even someone who's 'against alcohol' knows they could not pass such a law and get away with it in a society like ours. My point is that the only reason that cannabis is seen as worse than alcohol / tobacco is for political reasons. Yes doubts remain over the damage that cannabis can or cannot do but you have to also realise that there are also political motivations behind these reports / studies (and the attention they get in the media)... Can you really argue that alcohol or tobacco are risk free? That they carry less risks than cannabis?
I'm not saying cannabis is good for you (though it obviously may provide relief for certain conditions) nor that everyone (or anyone) should use it. Just that I don't see it as a crime to smoke cannabis (should it be made illegal to drink, to eat fatty foods, to act in any way which could shorten your own lifespan?) or to own it for your own personal use... I'm not 100% on legalisation - of the production and sale of cannabis - but it is almost certainly a low-risk drug and no worse than alcohol or tobacco... Indeed I would argue that it has less adverse social effects than alcohol and believe that - if smoked in pure form - you're actually at less risk than you would be from tobacco - though I admit that I don't exactly have all the facts on that one!