Actually, it's been scientifically proven that smoking causes extra folds to develop in the Myelin Sheath, a part of the nueron which renews and therfore speeds the chemical reaction that sends impulses down the axon to the dendites which send signals to their cell bodies, increasing the speed of the entire process. Basically smoking makes everything in your body happen just a little bit faster and that's on top of further proven increases in memory, muscle growth and concentration. If anything smoking keeps my brain from frying what with me doing the equivalent of constantly overclocking it... ...I hate you Psychology, I want my curtain of ignorance back.