The prolonged use of pot does change your personality, many people who smoke say this.
I'll agree with that, digd. Changes your personality usually for the better, generally making folks more open minded, less violent, and more tolerant. Take alcohol on the other hand.
I've taken 3 month, 6 month, 12 month breaks. Never really noticed any change, either way. Just confirmed to me that it's non-addictive. On the other hand, since the 16 months since I quit tobacco, I've noticed a significant change for the better, physically, emotionally, and mentally.
I sincerely apologize for saying that you are uneducated on the subject, but you tried to paint every user with the same brush. I know many people who smoke pot. MOST of those folks lead constructive, healthy lives. SOME people I know have experienced these lazy/paranoid/apathetic side effects, but I would say, in my experience with these folks, that they are certainly in the minority. Most of the folks that I know that DO experience the negative stuff, esp the paranoia, have ceased to use marijuana. but again, this is pretty rare.