One, it's called being DEPRESSED, and the state of being depressed is called depresive.
Isn't that a sweeping statement to make, though? Marijuana causes depression? I know quite a bit about depression, and not once have I encountered a solid study that states cannabinoids cause depression. Hell, in most cases, it's been the opposite. From what I know, depression is caused by many things, and it's often hard to pin down the exact cause case by case. Simple things like stress and trauma can lead to depression. It can get as complicated as genetics.
And don't think I'm hiding behind anything, there is a link between marijuana and depression. It's something called substance abuse. SUBSTANCE abuse is one of the causes of depression, not JUST marijuana abuse. Abusing any substance is idiotic, I'll grant you that. Too much of a good thing is never too good, including pot. You can become psychologically addicted to it, but then again, that can be the case with anything we encounter in the world. Hell, I'm addicted to shoes, and I'd probably get depressed if my collection got stolen. What I'm trying to get at is that the link between marijuana and depression is not as simple as it seems. There are tons of sociological, psychological, and in some cases, physiological factors that need to be considered for one to be labeled as a depressive person due to the abuse of a substance.
And again, I beg you to show me the study you claim. Show me were it states directly that cannabinoids are the cause of depression, and not the fact that the depression is caused simply by abusing the substance.
I also really don't see the link you're trying to make between a beer and a joint. I never knew that a person who smokes has to smoke a joint all the time, is that a Commandment now? Buddy, when I'm on a break, and I tend to smoke much more often, one joint of REALLY good shit doesn't do jack shit to me. But trust me, after my exams are done, I know half a joint would have me stoned out of my skull. Marijuana tolerance is very easy to build up. It's impossible to compare it to alcohol.
Oh yeah, beer isn't the only alcoholic beverage. You say one joint gets you high, thus rendering weed harmful? Shit, one shot of some really strong liquor can fuck you up. What's your point with that statement?
I don't feel attacked boss, I just feel that pot has such a bad image for no fucking reason. It doesn't kill anyone, it doesn't harm the body, hell, it makes the body healthier. The only time pot is bad for you is when YOU abuse it. I haven't smoked for weeks now because it's the end of the term. I haven't felt the need to go out and grab a bag of some fine herb. Moderation is the key.
EDIT:
I just HAD to get back to that anandamide comment you made, just to prove that you really are talking out of your ass here.
Anandamide, concentrate with me, is a naturally occuring cannabinoid. It's good for you. Infact, the name comes from the Sanskrit word "ananda", meaning bliss. It plays one hell of a roll in a person's behaviour. It's also crucial in early embryo development (which is why toking up while pregnant is a big no-no).
Now, THC and the other great cannabinoids found in marijuana and chocolate (Yes, even fucking chocolates have cannabinoids) BIND to the anandamide receptors. Cannabinoids trigger alot of things in the body, and most definately one of them is NOT the production of anandamide. Even if they DID trigger the production anandamide, which they don't, it still wouldn't cause depression. Get this, drugs that FIGHT depression trigger the production of anandamide.
That's why people who do suffer from severe depression smoke alot of weed. It helps them cope with life. It's no different than the garbage you buy over the counter. No wait, it is different. Pot won't make you a fucking pill popping junkie in the long run.
So please sir, get outta here with your nonsense.