I am flabbergasted that anyone truly believes chemicals can think, or that the influence of chemicals or any other natural substance can determine precisely what thoughts a living being can think or what actions a live creature may take. Poppycock on its face.
In a way, a conversation about this seems as useless to me as would a conversation with Sarah Palin about compassion. There is no common frame of reference on which to base a discussion.
So if you think "you" had no hand in deciding what socks you put on today, there's no frame of reference I can imagine to refute that - it is simply completely off base to my entire framework of knowledge and experience.
It's one thing to assert we don't consciously assist our heart in beating, but quite another to allege I had no option but to type the word "zebra" just now.
I typed and erased four other words before settling on "zebra." Was that a chemical process entirely physical in nature? Of course, we can never know. But why anyone would have such a notion is beyond me.
