"Junkies can smoke/drink/stick needles in their arms to their hearts content but I simply do not want to pay for them."
I'm sorry but the harsh fact is you do pay for them, one way or another.
If they are made ill from impure drugs causing infections, or the chaotic way they are living, then you pay for that in taxes as the NHS has to treat them (something that could be addressed with the decriminalisation for drugs,incidentally).
You pay for them when you insure you car / house / whatever against crime.
You pay for them in your council tax (money to the police to fight the war on drugs - something else that would be cheaper if drugs were criminalised)
You pay for them through taxes in money to prisons to lock them up when they have been caught with drugs (this cost could be avoided if addiction was seen as an illness rather than a crime) and also when they have been caught committing crimes to get those drugs (again avoidable if the drugs were decriminalised, and available like a medicine for addicts).
You may for them every time you buy something from the high street, as a small price of the items will cover those that are shop lifted.
etc etc etc I could go on.
The cost to society of having so many addicts is huge, and I'm afraid if you chuck them off benefits it's likely to get higher.
But until it's treated as an illness, rather than a crime we are unlikely to get anywhere!
If you simply want to talk money, by far the cheapest thing all round would be to decriminalise drugs, and make a clean supply available to addicts, along with treatment available. Overnight much of the crime problem disappears, the police are freed up to concentrate on other crimes. It would be a much nicer society for all of us to live in too!
Much of the pain and suffering to addict and their families would also be lessened if supply and purity were not an issue.
Our society (along with many others) has been part of an experiment to see if you can eradicate something by banning it. It's obvious that in fact the opposite is true - drugs have been banned for ages, and far from stopping supply, demand and supply have grown exponentially.
When you ban something you hand it over to criminals to exploit. To hand such dangerously addictive substances to criminal gangs is the biggest crime of all I think.
So, in answer to an earlier question (sorry I forget who said it), I do blame the government for the addicts and the situation we're in actually. I blame them, and the last one too, for not having the guts to have an adult conversation about this. But then that's not they;re style at all is it 
The war on drugs is unwinnable, but they are too gutless to face up to it, and this government are using it cynically for their advantage by stirring up the likes of pink4ever who sadly can't see what a disaster for our society treating people in this way will be.