DD, good points. I think they support my general premise that it's an expensive proposition to fight the drug war at the destination (end users), rather than the source.
Re: a huge number of people can fit the definition you used at some point in their lives: people ranging from obama to rush limbaugh has had a go at alcohol or drugs... Not everyone needs government help with it, though, in my opinion.
I made the same assumption, but started with a figure that said about 7% of the population claims to have used illicit drugs in the last 30 days. I made the initial assumption that most of these can be considered "frequent" drug users, and only 25% of this number were frequent users with a "drug problem". These may all be B.S. assumptions, but at least it seemed a reasonable starting place, and I can believe that roughly 5M Americans have drug problems of one kind or another - though it may be even more.
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