I couldn't personally say anything definitive on the subject of plant spirits; they may very well exist in some form; however, as we don't really know what form our own spirit/soul exists as, I think we're delving into very hidden waters. However, in either case- we know that psilocybin mushrooms contain a tryptamine regarded as the active component. We also know that our brains create and release tryptamines on a regular basis, and the most commonly know one is serotonin. Given its seemingly abundant role in human mood/perception/perspective activity, as well as such actions as regards to blood flow through the Body and preocessing of external stimulii (the same stimulli we consider to be 'the world'), I guess that it could be said that the tryptamine within the mushroom-body also regualtes such things for the mushroom, in a relative sense. And we, upon absorbing that tryptamine, do 'feel' what a mushroom maybe be feeling.
The thing I don't understand re: this Debate, is why people insist that the mushroom-spirit/molecule would be spiteful or angry or judgmental, and, by default then, 'better' then us. I've seen a lot of talk about respecting the mushroom as if they resemble the christian god, who DEMANDS respect. I believe thats misguided, or at least, misplaced. In my own experience with mushrooms and tryptamines in general, I haven't experienced anything that hasn't been benevolent in intent. Whether these things be aspects of our mind or actual beings contianed within these molecules- is not important to me, as what is presented and perceived as real, IS real. Though, if the force we enounter is autonomous and seperate to ourselves, I believe it to be benevolent; rather then being wise and all-knowing, it seems to invest moreso in creating paths to wisdom and knowing for ourselves. Hence, I would refer to any possible mushroom spirit as a Teacher, not a god or Great power.
I personally believe that- plants have sensience of a form, just as we have sensience of a form; however, there is nothing but my own belief to support this. That said, my own belief is what creates the world- for me.
It can't be denied that a molecule is what creates the potential for psychedelia in ourselves; but it can't also be discounted that this mind-manifestation isn't enacted by forces outside ourself. Each viewpoint is true IMO.
In conclusion, I don't think it matters to a mushroom whether you consume an opiate before you trip; what does matter is how it effects you. Which, depending on your views, could be positive and pleasurable, or negative. I would not take a strong opiate if I desired a clear picture when tripping, but physically I don't feel there is any danger, and spiritually, the only entity whose existence you can confirm (yourself) will be as you will.
Raar.