Al Jazeera English - Americas - Mexico losing war against drugs
Wow, I had to go all the way to Aljazeer to get that bad news.

Here are some theories on drug use
http://www.umsl.edu/~keelr/180/theordrg.html
And I like the conflict theory the best.
Assumptions:
A. Two kinds of drug use
1. Recreational--Cultural Conflict
2. Abuse--Individual destruction linked to structural inequalty and collapse
B. Movement from recreational use to abuse more likely within impoverished populations (SES and drug use versus SES and drug use problems)
No drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power.
I like that quote too.