I would have to somewhat agree w/ morningstar on this one. Marijuana isn't really addictive (trust me, i know), and legalizing it would most likely end the market for it.
Agree, this needs to be done. The quantity of people living in almost total poverty enslaved by the dealing/consumption market, and the mafias behind that intricate reality saddens me. Personal cannabis farming and possession (small quantities) along with an extensive social awareness campaign, can erradicate that problem, and more marginalized population would have better standards.
Almost all south america has a strong drug-dealing issue, so I'm glad so many people see marijuana not as a taboo, or an unmanageable issue, but as a consumption good.
True, marijuana is psychically addictive, but that's a different matter...
Apart from that, the biggest businesses in the world turn around drugs (from "hitler won the war", not a neonazi book, just a second point of view of the world, very well argued), involving even the biggest gobernments... So, for them is convenient to make it illegal as to keep on with the business
On the other side, prohibitions, all over the world, only made the prohibithed whatever more desired (as with most of the now accepted human rights, or with the worker's rights), and marijuana will keep on growing illegaly unless it is legalized and regulated (not to mention to educate the masses about it)