The concept of "choice" as most people use it when describing consciousness tends to be synonymous with so-called "free will," and it is a metaphysical concept rather than a descriptive one. It implies the existence of some kind of non-physical "choosing" mechanism that is unbound by the law of physics.

I have no problem with the concept of choice as you have expressed it, as shorthand for an immensely complex set of processes. This is similar what I was referring to when I mentioned "moods" and "states." I do realize that brain processes can't be accurately represented by fuzzy concepts such as these, but they are occasionally useful for discussion.

> The brain is electrochemical activity. There is no factorization of this system into brain states and chemicals that act of them, nor any other such factorization such as binning hormones into such states and describing neuron depolarization as acting on these states.

At a macro level, a higher than normal quantity of cannabinoids will cause the brain to act differently, with certain predictable characteristics. You could even give it a name as shorthand: "stoned." At a micro level, you could describe the effects of the chemicals on receptors. In between, you can talk about the effects on various brain structures and how that affects behavior. That's what I'm getting at.