I don't watch much TV either. Everybody I know, when high, has complete control of themselves. Some people, it is the only time they can control themselves (mainly those with severe ADD/ADHD, or muscle ticks.)
I have noticed, many people who are anti-weed, only say what they have heard. However, there are many people who smoke weed, and can counter all the stuff the people have heard. Be it a hippy who ocassionally enjoys a "wake 'n bake" (smoking first thing in the morning), an artist who has new depths of creativity to explore, a cancer patient dealing with pains and nausea from chemo, someone who is hyperactive and wanting to slow down, or just a group of friends having a good time, there are plenty of us with our own experiences, of which very, very few have violent or fatal endings, psychotic break downs, or any of the other horror stories. I myself know of one man who was killed over a drug deal involving massive amounts of marijuana, one guy who stabbed another guy over a deal gone wrong, and one instance of it triggering an eptiliptic sezure. I also have come across two people who are allergic to marijuana, and do not smoke because there is a chance thier throat could swell up and suffocate them. And that is only a few out of dozens of pot heads I have known throughout my life. And as far as the first two I mentioned go, those incidents could not have happened if marijuana was legal, because there would not be big money for black market tycoons to make from it. And since pot heads are everywhere, there is alot of money to be made from weed. As far as adverse health effects, some people are allergic to direct sunlight exposure, and even the air in most cities isn not healthy to breathe.