I think it is based solely on your state of mind before you smoke. If you are in a relaxed mood, it will amplify it. If you are party central, you'll probably have the best meaningless and meandering conversations of your life.

I find that I can control my level of awareness quite well when I'm high. If I'm out somewhere, I can engage myself into everyone or I can sit back and people watch and not space out. Also, when I'm coming down off a high I usually tend to become more and more awake. Strange.