Of course there are Caz, I'm not saying there isn't but I do agree that drugs are not always an evil thing and actually I think that some good things have come out of them and will do in the future too.
Skunk is supposed to be useful in pain relief, there was some research being done at one point regarding E because it was believed that it might have some benefit to people suffering from althezimers/parkinsons, (whether that's true or not I don't claim to know). We all know about the drugs in hospital that contain froms of heroin (meths and what have you) which can ease pain and anaesthise (bad sp).
Then we've got tribes all over the world who have some plant or herb or something they use. Drugs have been around for a long time and humans will always use them to gain a different perspective/get in touch with their Gods etc... The problem I think comes from the highly addictive drugs and that some people take drugs (any form) to numb themselves to something on the inside.
Yes, addiction (of any sort) is a dreadful thing. I speak from experience on this. Of course I wouldn't wish a drug addicted mother or father on children. Believe me, I'm not trying to cause offence, but I am just putting my own take on what I think is an interesting discussion.
I stand by the fact that I do think that some good has come out of and will continue to come out of drugs.