First of all, thx to all! And yes, it's from a lecture Jung gave in 1935. There are notes from several note takers (one set of them in English, the others in German), which I compile into one text, and then translate the German passages into English for publication. In this particular instance, most of the phrase is taken from the English notes, but one Swiss listener marked "Kausalitätsschnüffelei" as a direct quote, and I'd like to carry over that colorful expression into English.
This much said, I like Marianne's #12 "sniffing out causal relationships." It's actually pretty close to my own try in the OP (except for the typo, of course, for which my apologies).
I'd never heard the word before, and I'm grateful for no me bré's info in #3.
Ad Bion #10: I think you may well be right, although there's no way to prove it since Freud is not mentioned in this context. BTW, would your nick's first name be Wilfred?