I do not use drugs in any form...I'm just not that person. However I was reading the discussion and wanted to say there is no proven fact marijuana does or does not kill brain cells.
I have my BA in medical science, one of my main studies has been chromosone research. One of the last studies I did was the effects drugs have on your body and brain. With that said....
Marijuana's active ingredient is THC (much longer name I wouldnt be able to spell out using my iphone keypad). THC is what makes you "high" it will bind with certain receptors in your brain and interferes with normal brain function. Thus the feeling you/some get of being off balance, sleeping, hungry etc etc.
However THC does become inactive. It does not "kill" brain cells. It temporarily alters them. If you (you being a blanketed term) did full research you would know the entire idea of "killing brain cells" started with a compaign to end teen drug use. It did not start in the medical field.
I'd also like to say Pinky's ex husband didnt sit on his behind smoking all day because of weed, he did so because he was lazy.
In the end its your body and you can do as you see fit with it.