Didn't Terrence McKenna think at one point that our beloved shrooms were planted by aliens as some form of a message? By that logic, 4-HO-DMT producing mushrooms aren't any more natural (in the nature vs nurture sense of the word) than 4-HO-MiPT producing ones and they could exist on our planet today. Maybe lifeforms on another planet don't have DMT, but MiPT or DPT as their omnipresent psychedelic compound, and they're all tripping on miprocin/4-HO-DPT-mushrooms?
But the universe follows natural laws, and its formation was dictated by evolution, so imho, if in fact fellow lifeforms from another planet "dropped off spores here, or perhaps taking a more scientific approach the spores are the ET lifeforms (spores are hard as fuck, and its been scientifically debated as to the viability they could survive the vacuum/radiation of space travel) and traversed space to reach our planet, its still interconnected, still part of nature. Perhaps nature is as big as you can imagine it, in reality essentially its the universe and the process that created it. So those ET's/spores are just as much a part of nature as a star, planet, quasar, galaxy, nebulae, sentient life-form, or the basic quanta that underlies what cannot be perceived at such scales.
Natural is a purative relative term, and its only limits are that which we choose to put in place. ET's/spores traversing space from another location, is a natural process imho. Confine nature to planet earth, and you can say its artificial/synthetic. I like to leave all options on the table, though, it can make things a bit messy at times.
Hell, perhaps our genesis (in terms of cellular evolution on earth) was a natural/synthetic/artificial seeding by another more advanced race, making our concept of nature infinite. depending on how you approach the concept
