That's supposed to be comforting? Alzheimer's isn't the only way for your mind to fall apart, and a lower bound of 12.5% of that happening doesn't give me warm fuzzies. Aging really, really sucks and we need to fix it.
1.) I'd rather have a 10% chance of dying than a 10% chance of living many years with something like Alzheimer's.
2.) I'm not someone who says "I wish I could quit but I'm addicted", I find it easy not to smoke but I do it because I really enjoy smoking. I'm trading possible early death with current pleasure. Alzheimer's doesn't have any upside or choice involved.
Probably should have added something like that to the original post, my pardon.