Your so-called "soul" may in fact be "completely material", but I don't think what you describe above proves it.
There was a famous mystic who once said something like, "when you put a lit match to cotton, it is not the fire that burns the cotton, but God."
Relating it back to your account, how can you know if it was in fact the chemical that changed your consciousness and not the grace of God (or gods, or the devil, some alient, or the program/programmer running your virtual reality, etc).
There could be some cause that caused you to both take the chemical and to have the experience. Or they could be caused by two independent things, with the experiences just happening to succeed one another in time (see Hume's critique of causality).
Finally, I'm not a physicist, but from what I've read, even physicists now have a lot of trouble defining "matter" as such. I don't think they even use the term much at all anymore. And, whatever reality happens to be, it might be infinitely divisible, and ultimately not completely understandable or knowable as far as science is concerned. At the very least, science now does not have a full understanding of it, and to say that science will one day have such a full understanding is merely an expression of faith.
As someone with physics training I do not see physicists having this trouble.
> I don't think they even use the term much at all anymore.
Most the physicists I know use it often.
Please be a little more careful when spreading information you are not sure about. The best way in my opinion is to be specific, give concrete examples, and/or give specific resources that you drew your conclusion from; preferably resources with concise explanations, more people will look into them that way and get back to you with their analysis of the source, it's like getting a free tutor.
>As someone with physics training I do not see physicists having this trouble
What is definitively known about mass besides E = mc^2 and the limited information we now about the Higgs Boson?
>Most the physicists I know use it often
I'm glad the physicists you know use it often. Why is it used so often? If it was known what matter and mass was there would be no need to discuss it.
Also, the Higgs boson is more interesting for its evidence in spontaneous electroweak symmetry breaking than for its ramifications on matter. Despite what popular science tells you, it actually doesn't give most of what you think of as "matter" its mass, that's quantum chromodynamic interactions.
Re Hume, not to mention Leibnitz, I didn't mean proof to a logical certainty. I meant proof beyond all reasonable doubt. But if you want to believe that God hides super-soul-cleanser inside simple chemicals, then more power to ya!
To tell you the truth, I actually believe in epiphenomenalism, which is a kind of materialist dualism, but that's beyond the scope of this discussion.