Krokodil?

Shitty homemade Russian desomorphine, I've had fentanyl.

Ayahuasca?

Ayahuasca is a brew in which you have a DMT-containing compound and a MAOi in order to get it through to your brain, so to speak. (That's not how it works neurochemically but I'm lazy in writing rn so that'll suffice.) Drinking Ayahuasca means the ROI (route-of-ingestion) is oral, meaning rather slow. It does last a long time, 10-12 hours, (context pending). The psychoactive element, DMT, is something I've smoked. That is a much faster ROI, and although the trip is shorter, it is way more intense, and the only way some people say a breakthrough dose is possible. Ayahuasa is milder and lasts longer, and is done in a setting in which there are professionals (not medical, but spiritual, 'shamanical', if that makes sense) and is more therapeutic. Smoking DMT is... a rather more intense, more psychedelic experience. Less than 10 seconds after my first hit... the walls started... "living in time". I remember using those words, but as of this moment, I couldn't explain exactly why. After the trip, I also said "I met God" and I know I just used it as shorthand, because I don't believe in a singular deity whatsoever, but.. it was just as clear to me as 2+2 at the time that I had sort of talked to the "consciousness of the universe" or however you might be able to even attempt to simplify it to a few words.

https://www.youtube.com/watch?v=3Bvi8206lpA&ab_channel=ELVES https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8716686/

There's a few resources for anyone who found my that intriguing.

Jenkem?

Greatest memelording of the early 2000's, not an actual drug, but other volatiles I could recommend are nitrous oxide and, among others, ether. (I'm also growing my own mescaline, and have been for the past ten years, not that it's an inahalant of any sort, just the movie reminded me. It takes a while to grow mescaline cacti, so growing it doesn't mean yielding it.)