It also doesn't do what the OP thinks it does. It's more like a Hawthorne effect - eventually your body adjusts to anything. A few years ago I had to give up n

It also doesn't do what the OP thinks it does. It's more like a Hawthorne effect - eventually your body adjusts to anything. A few years ago I had to give up nicotine (and caffeine and alcohol) cold turkey; I did not become appreciably dumber, past the expected adjustment phase. It really doesn't do that much for you, certainly not enough to be worth the addiction.