Saw this posted in another weed thread and couldn't have said it any better so ill just post it here -
"It's pretty fucking ridiculous for the government to tell people what they can and can't do with their body. Somebody smoking isn't going to hurt you. Honestly it's not hurting them either but we won't go there. Should the government tell fat people they can't eat fast foods? How far should it go? I mean alcohol is legal and far more dangerous than marijuana. But besides that, since it wasn't really the angle I'm going for... 
Marijuana prohibition is retarded. It hasn't kept people from smoking it, it hasn't made it disappear. Where has it gotten us. We spend 50 billion a year on the drug war. We put 10s of thousands of people in jail every year for non violent drug offenses. 
That's all fine though but you can be against the idea that people should be able to do what ever they want with their body. I think that's a big fuck you to the constitution and pretty ridiculous, but whatever. Here's an angle for that... 
Even if you believe that marijuana is an evil drug and should not be used by anyone, blah blah blah. Drug prohibition doesn't work. IT failed hard for alcohol prohibition. We need to learn from our past mistakes in history, not continue the same faulty ideas. Alcohol prohibition didn't even come close to getting rid of alcohol. It brought in organized crime, gangs with machine guns, had people selling ghetto ass bathtub gin, put not violent people in jail. Same thing happened with drug prohibition. IF you get into the economics of it... Prohibition made drugs a crime, making them illegal sent them to the black market, plenty of room for profits to be made here. You raise the penalties even higher to make people more likely to stop, all you do is raise the price of the drugs which creates more money to be made. Every time you arrest a dealer, it opens a window for 5 more guys to fight to fill that void. It's like a tree dying in the rain forest, that spot doesn't sit there vacant for long. A whole bunch of plants try to fight there way up to get the sunlight now open. As long as drugs are illegal, there will be money to be made, and no shortage of people trying to get rich. For gangs this is the perfect opportunity. Sell drugs, profit$$$$$ huge, buy weapons. Shoot the piss out of rival gangs for moving into your turf. 
Then the other angle of HEMP and industrial application. The energy problems we're seeing today should make us more likely to start using hemp. Instead we're getting shitty alternatives like corn ethanol. There is a breed of hemp plants made specifically for biofuel. We could start growing it to offset our oil dependence. Start using it for paper, hemp fiber paneling. Henry ford knew what was up when he built the model T. Hemp paper lasts for fucking forever, like the declaration of independence. Yields better and grows annually. 
Our founding fathers, presidents, all kinds of people back in the day grew hemp and used it, many smoked it. So why is it a big deal for somebody who wants to get high after work? How does that hurt you? 
"pot should be legalized for medicinal use, with regulation so not every pot head who claims their eye hurts can get some but rather pot for severely ill patience like this kid" 
Yeah that's abuse of the system but the system is completely whack. 
How does somebody smoking a bowl in their house after a long day have anything to do with you and your life? "