Legalization of drugs, pros and cons!

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I have to say, I found this thread very interesting, but mostly for the fact that not many who've posted have mentioned actually using these so called 'recreational' drugs, I personally smoke pot, but not for fun, I smoke because first and foremost it is the most effective painkiller for my disability.
I've had rheumatoid arthritis since I was in my teens and I've been put on most of the drugs available from the BMA (British Medical Association), now there are some which are only available in the US, because the medical association here deems them to be too unsafe/untested to prescribe to Brits, and those I have taken have more often than not had such major side-effects that I was worse off on them than off, so, if my RA's really bad, I'd much rather smoke, even my Consultant in hospital only has issues with my smoking pot because of the fact that I am smoking and not eating it ... Most doctors and police officers I know would legalise some drugs in a heart-beat, because they know of the benefits and in regards to the police, it would be far less paperwork/foot slogging for them to do.
Amsterdam hasn't fallen apart since it was made legal there, and I don't see how a country cannot benefit from legalising the likes of pot. Harder drugs, however, is a different matter, I've seen heroin kill people, I've bured two friends, so far, who've OD'd, and I don't care to see that happen to any more of my friends.
So, should drugs be legalised? IMHO, some should yes, whereas others, definately not, isn't it bad enough that kids are out on the streets killing each others with knives and guns without giving them free reign to then kill each other with 'bad' batches of their drug of choice??