It's not non-deterministic but as the dose grows the effect gets stronger. Since the effect is mind altering you can maybe understand how a _very_ altered mind

It's not non-deterministic but as the dose grows the effect gets stronger. Since the effect is mind altering you can maybe understand how a _very_ altered mind is too different from your normal state for you to remember what it was like being high. Also a mind-state is affected by context and the context never stays the same, which means there will be some variance. However I'd argue that the question "can you use <psychadelic> correctly?" makes no sense since the word 'correctly' implies a frame of reference while the psychadelic will force you out of any such frame (depending on dose). Historically there were complex rituals for "correct" psychadelic use, all heavily religious of course. Our society is not willing to let something like that into the mainstream. Edit: Sometimes "correct" usage of a drug is to not ingest it, for example cyanide :)