Well here's my opinion from an experienced user.
Weed chills you out, and gives you a good buzzing feeling. I find with weed it can really help you to concentrate, and an activity enhancer. With the concentrating thing tho, you can only concentrate on one thing really ... that's what i find atleast. It's good for me because I always blaze and draw, and i can keep my motivation going, and like i said it's an activity enhancer for sure so it's funner too. It also enhances the taste of food for sure. You just have to know when to draw the line, if I smoke 2 much everyday for awhile i start to go a little screwy, but when u stop after a few days my mind clears up again and it's back 2 normal. Just don't over abuse it, take occasional break and shit and it's a great drug. I never really have cardo problems either. If I could do valum or t3s tho, if they were available 2 me i would probably smoke less than i do and pop some of that shit. If you ever get really burnt out from weed - it's probabley because it was laced with something to make it heavier or w/e so ur dealer is getting more money. if u get good shit u shouldn't have a bad burnout and worse comes to worse you'll just b tired. that's the worst side effect i ever have, really hungry or tired. which is why weed is great for people with sleep and eating disorders.