alcohol

umm...but brain cells do not regenerate.

Oh well...still, I'm not worried about my pot smoking rotting a big hole in my brain. There's simply no medical evidence of anything like that.

Alcohol seems to have a worse effect on your body. Im just speaking from personal experience. Alcohol consumption makes me feel tired, run down, headaches, sometimes an upset stomach.
I have never had any negative side effects from weed smoking, except maybe eating too much!
Weed makes me sleep better at night, and I never wake up with a hangover, in fact, its the opposite. I feel even better rested.

False.
http://healthlink.mcw.edu/article/926345803.html
http://www.princeton.edu/pr/pwb/99/0405/brain.htm

The damage caused by alcohol is supposed to be at least partially reversible, as in your brain will regenerate itself after you stop drinking...unlike the liver.

The relationship between drinking and the liver:
Liver turns to FAT turns to SCAR... who wants to crack a beer open now?