I think everyone understands what the term drug user refers to in the context of this thread, although to the cantankerous members a simple statement like that may be difficult to comprehend...geeezzzzzzzzzzzzzzzz
No, I don't think everyone does.
This thread started as a discussion on the dosage of prescription meds and has moved on to the wider issue of drugs.
I'm not going to insult you by quoting a dictionary definition of 'drug', as I'm sure you know what it means.
You stated:
"I am well aware drug users bring plenty of misery to everyone they come into contact with, they live totally selfish lives and would they really be missed?"
It seems you have a lot of experience of people in the grip of serious addiction - to perhaps, heroin or crack - and are wrongly associating all drug use with the social problems that can occur with addiction (as with alcoholism), or if not first-hand experience then maybe the influence of the media has played a big part.
Either way, I bet you've met many people in your life and they have not brought you misery, although you may have known nothing about it I bet some of those people have used some sort of drug at some time.
Myself and most people I know use or have used some drugs (inc. alcohol and tobacco) at some times - we don't "bring misery to everyone we come in contact with".
Most people can enjoy alcohol and not become alcoholic, it's the same with other drugs. Please... make the distinction between recreational use and abuse or addiction.