Who believes?
I take a chewable every day - doctor's instruction. I don't know if the chewable part is necessary this far out from surgery. I was originally told to do a chewable so that a bit of undissolved aspirin didn't sit on the suture line. But I'm use to it now and figure the chewable isn't going to hurt anything.
I have a work friend who's also a pharmacist. He takes 2 LD aspirin a day. Claims they're finding benefits to doubling the dose.