I take as one of my premises that we are a part of the Universe, rather than existing outside it somehow. With that in mind...
It seems to me that way the Universe behaves must be either deterministic or random. The more we learn, the more deterministic the Universe appears to be. Where once the wandering of planets across the night sky seemed random, now we know it to be deterministic. So it is with the processes within our brains. We are learning more about which chemicals do what, and how the whole thing works together allowing us to think. So what once appeared as randomness in our thoughts or actions (the "free" in free will), now appears more deterministic.
In point of fact, our thoughts, actions, feelings, etc., seem to be controlled by chemical reactions inside our brains. These reactions, by their nature, are deterministic, even if they are too complex to be predictable. Technically, I think that makes them Chaotic, but I digress. In my view, the Universe is deterministic, and, as part of the Universe, everything that makes us what we are is part of a deterministic system. Hence, there is no free will. There may be "will," but it is not free.
The other side of the coin, of course, is that there is randomness in the Universe, and it is from this randomness that the otherwise deterministic processes in our brains are foiled. I would posit, however, that if our thoughts, actions, feelings, etc., are part of a random system, that still does not equate to freedom. Furthermore, if they are random, they shouldn't even rightly be called "will."
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"If I cannot smoke cigars in heaven, I shall not go!"
- Mark Twain
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