I used to smoke about 3.5 grams myself daily. I loved weed. I am currently not smoking because I need to take several urinalises (sp? heh) in the upcoming months.
I like myself much better not smoking, and I dont think ill ever go back to smoking weed. TO avoid a long drawn out post, herbs made me a big pussy. They messed with my emotions, and made me very antisocial. I also had noticeably slower cognitive abilities when there was THC in my system. I am much faster, stronger, and all around "better person" not smoking marijuana. This is just me, and may be different for other people.
No, you can never be perma stoned, just like you can never be perma tripping (you may be permanently psychologically affected by LSD, but never permanently physically affected).