..ok coming in for dreamer042..
but not with big guns, just some conjecture...
dreamer042's references to ancient alchemy was a good start...a lot of this knowledge is as advanced as a lot of modern chemical procedure (if not having an empirical/structural basis behind it) ..certainly more advanced than most nexians and modern dmt extractors...
entheogenic-gnosis made a very good point with the observation that the ancient greeks had naptha and strong bases..
..an example par excellence of ancient greek chemical technology was
Greek Fire, a military technology which would be hurled by catapult at ships, and would stick and burn underwater...it is still not understood today how or from what it was made...
one ancient reference mentions: "From the pine and the certain such evergreen trees inflammable resin is collected. This is rubbed with sulfur and put into tubes of reed, and is blown by men using it with violent and continuous breath..."
of course, like many ancient chemical things, the formula was a highly guarded secret...like the Kykeon..
or the ancient Indian alloys which it is still not certain how they were made (and i don't find aliens a very likely explanation)
and this is a big point when people are talking about source based evidence...in most of the world, most of the time advanced preparations of plants were highly guarded secret knowledge (not like south america and its often very loose lips) ...in short, they just weren't or aren't going to tell you, so the evidence won't be written down...we can only infer from their level of procedural knowhow..
and it is well evidenced that indigenous and ancient peoples knew how to (and did) separate oils or non-water-solubles from solutions, and could basify things..as they did the dmt containing seed snuffs which were smoked in the ancient Andes (Schules and Hofmann) ..
i think it comes from a modern naivety and assumption of the 'apex' of current scientific paradigms to think that ancient peoples could not have gotten to smokable tryptamine extracts to some degree..say 90% alkaloid, good enough..
i mean, ancient pre-modern science worked out things like dart poisons that are lethal with just a prick to the skin, but orally ingested are medicinal...and indeed the ayahuasca synergy itself...which our modern scientists scratched their heads over for a while, and learned from..
so i personally think quite firmly that they (we) did in the past...but no one was going to write it down, or tell you unless you swore an oath on pain of death, or could be known to keep your mouth shut - still won't...
the likelihood, however, of aliens from another star system arriving in physical space ships (with presumably above light speed travel to do this) i find lower than smokable tryptamines from plants by intelligent humans with a lot of time on their hands, and databases like the library of Alexandria, or thousands of years of customary knowledge passed down (till the Roman/Christian Empire dealt with most of that)
keep up the conjecture nexians !