Sometimes talking to a Marijuana smoker about side effects and symptoms to their use is like trying to convince a liberal that there is no left wing mainstream media.
If you are willing to do that, then we can talk. If not, one can assume you are simply going to rely on silly hyperbole like comparing tar in cigs to tar in a joint - as if the amount of consumption were anywhere near the same.
The "Truth About Marijuana", to use your phrase, is that it has significant demotivational effects coupled with changes in perception, and long term smoking can have other adverse health effects. Heavy use makes you lazy and slow. And its harsh on your lungs. And that's it. Anything else you want to claim about it is simply not supported by the evidence.
As far as the schizophrenia crap goes, I'm sure you got far enough in school to know the difference between correlation and causation. And I bet you got far enough to know how to be deceptive by confusing the two.