I'm not sure what I have said that you consider to be "propaganda" comparable to anything the war-on-drugs crowd regularly spits out. Of course there's a cost, I never said, nor meant to imply, that there wasn't. All I'm trying to say is that any detrimental effects of marijuana use are outrageously overblown. I suppose side-effects could be considered "harm" but I'm talking about more serious, longer term effects. I simply do not believe marijuana, or even inhaling CO from smoking it, has a negative effect on the brain, whether you've worked with researchers who have purported to prove that or not. I will continue to read the studies and I will try to keep an open mind, but based on what I've seen so far I just don't buy it. In fact, based upon personal experience I believe exactly the opposite.