Felix, why don't you post studies touting the benefits of cannabinoids, such as how marijuana helps facilitate the growth of neurons, in conjunction with supposedly-and-potentially-negative-but-most-readers-and-reporters-didn't-really-understand-the-point-or-message studies?
Maybe you're just jelly they can smoke weed and have a good, normal life? Maybe you have some weird history with marijuana that you are not sharing with us?
Now, make sure you read this all before you write it off as entirely anecdotal (see later part of reply).
Let's see, it is uncorrelated, but my grades went up after I started using it (B.S. in Computer Science, then got my M.S. in Information Systems, so not always a walk in the park).
Anxiety levels went down. I have minor anxiety that is easily controlled, but marijuana has helped "smooth" it out in the past few years.
Overall sense of well-being went up. Was already a very happy person with no real life complaints (started it entirely out of curiosity and decided to keep using because, hell, I like it!).
Confidence and life motivation went up.
Found myself becoming more interested in a wider variety of topics.
Became a more empathetic, caring person.
Desire to go outside vs. staying inside increased.
Noted and other benefits do not disappear when stopping long-term. Even if these were completely unrelated to my usage of marijuana, that still flies in the face of what you are trying to incorrectly assert about users.
As for downsides, I seem to have developed a slight dependency to it, in that I get minor headaches if I go without for a day or two. Less of an issue than a caffeine dependency, for sure, and that is pretty socially acceptable. Not something I'm worried about in the slightest. Most users report no forms of dependency, but I think it is mildly addictive but for mostly psychological reasons (like the internet).
Oh, it's not the cheapest thing in the world. Good thing I have a kick-ass job that I worked hard to secure and love going to on a daily basis. (Interestingly enough, I also work with a lot of users that I'm assuming you would believe they are hiding something terrible about their lives, or whatever. Some of my most motivated, high-reaching, intelligent coworkers in this corporation are regular users and have been since college, at least.)
Uh...can't think of a whole lot else. It has been mostly fun and beneficial with relatively few and minor downsides. I can live without it and be just as happy, but I can technically live without many other comforts in life and find ways to be happy too. It's nice to have around.
HOWEVER! I can personally draw up anecdotal reports of people I know that fall into the broad spectrum of marijuana users. Some fit the stereotypes. Some are even more successful, outgoing, and motivated in life than I am. Some are about as average as you'd expect. In other words, anyone in any life scenario could potentially be a marijuana user! *GASP*
Basically, finding out who uses marijuana is the equivalency of figuring out who is a Cylon. They're normal people from all aspects of life in all scenarios. I repeat, marijuana users are hiding among all of us from all walks of life! BEWARE!
Thus, it is important to not be a complete, naive, strangely-aggressive boob about the topic of marijuana, whatever your "side" may be.
I have said it again, and I will say it before. It is VERY important to consider what you put in your body while it, and especially your brain, is developing. So far, and from my anecdotal experiences, it seems it is safer to avoid marijuana until you are AT LEAST 18 or, better yet, 21...or 25 for best results, when the brain should be fully developed. I have yet to see evidence that use as a fully developed adult is detrimental (barring that everything in life caries a variable amount of risk depending on the person and situation), but I continue to look out for new studies on the matter.
Really, most of this is not news or unexpected to those more educated on the subject of marijuana (sorry, Felix). So far, many early studies seem to indicate brain changes,
and you have to read carefully instead of assuming all changes are bad or completely understood, are more likely to take place the younger you start using marijuana (i.e., when your brain is rapidly developing). I did not know this when I started, but I started using regularly half-way through college. I seem to have come through unscathed, but it does remain to be seen how it might affect very long-term users. I have met users that started around the same time as me but did meet more downsides...usually, at that point in their life, they were likely to recognize this and stop before it became an actual problem. Not always. Thus, I encourage everyone to be smart about marijuana usage, because it's a wonderful thing if you're not a dumbass about it at let it control your life.
I don't think you'll get many other users who tout the benefits and awesomeness of marijuana while openly discouraging young folks from using it exactly because of these reasons and also recognizing that, in the end, it still isn't for everyone!