what if you didnt loose your memory, you just made a concious decision to change. like what if you decided tomarrow to stop smoking (assuming it is a big part of your life), and by cutting out a chunk of who you are, would you still be you? if smoking used to be a big part of your life, can you honestly say you are the same you as you were back when you smoked? you would no longer be the same person as you were, and would most likly even make different decisions then the "old" you would (maybe not alot, but some).