I watched a program on CNBC last night call "Marijuana Inc".
a href="http://www.cnbc.com/id/28281668/">Marijuana Inc They spoke very little about the uses I mentioned . Their's was more or less about the recreational uses. The one undeniable fact they presented was the billions(BILLIONS)of dollars it generates for the economy in California, with the next largest "legal" industry generating only half!
I won't use the word "harmless" because it's not! But I'll gladly sit here and type out some horrors that have gone on in our schools, our local communities or in our own nations that would have been better served if we weren't spending countless billions of dollars busting people and ruining their lives because they like to smoke pot. We watched them do this 70 years ago with alcohol prohibition and today we say "that only makes sence, take it out of the hands of the criminals, and for the most part, that criminality goes away".
Some will say it's a "gateway" drug and it leads to harder drugs. If that's your stance, then you had better put coffee at the front of your list!

ps
I would much sooner shread my old car and smoke it, than send it to another country as scrap so they can make more cars, send them back and put me out of work!